Cherokee Heating problem
01-30-2007, 08:14 PM
#11
Guest
Posts: n/a
Re: Cherokee Heating problem
Nightcheck proclaimed:
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
Does the temperature guage show the engine is getting hot?
Coolant nice and fresh or all crudded up?
If you check the hoses going to the heater core, do they get hot?
Suspect your thermostat has a bypass, so even a closed thermostat
shouldn't cause loss of heat. I would think a bad water pump would
cause engine overheat unless it is extremely cold.
Got any fluid flow in the radiator?
You could temporarily pull the hose at the heater inlet and see if you
get flow [into a big container].
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
Does the temperature guage show the engine is getting hot?
Coolant nice and fresh or all crudded up?
If you check the hoses going to the heater core, do they get hot?
Suspect your thermostat has a bypass, so even a closed thermostat
shouldn't cause loss of heat. I would think a bad water pump would
cause engine overheat unless it is extremely cold.
Got any fluid flow in the radiator?
You could temporarily pull the hose at the heater inlet and see if you
get flow [into a big container].
01-30-2007, 08:14 PM
#12
Guest
Posts: n/a
Re: Cherokee Heating problem
Nightcheck proclaimed:
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
Does the temperature guage show the engine is getting hot?
Coolant nice and fresh or all crudded up?
If you check the hoses going to the heater core, do they get hot?
Suspect your thermostat has a bypass, so even a closed thermostat
shouldn't cause loss of heat. I would think a bad water pump would
cause engine overheat unless it is extremely cold.
Got any fluid flow in the radiator?
You could temporarily pull the hose at the heater inlet and see if you
get flow [into a big container].
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
Does the temperature guage show the engine is getting hot?
Coolant nice and fresh or all crudded up?
If you check the hoses going to the heater core, do they get hot?
Suspect your thermostat has a bypass, so even a closed thermostat
shouldn't cause loss of heat. I would think a bad water pump would
cause engine overheat unless it is extremely cold.
Got any fluid flow in the radiator?
You could temporarily pull the hose at the heater inlet and see if you
get flow [into a big container].
01-30-2007, 08:14 PM
#13
Guest
Posts: n/a
Re: Cherokee Heating problem
Nightcheck proclaimed:
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
Does the temperature guage show the engine is getting hot?
Coolant nice and fresh or all crudded up?
If you check the hoses going to the heater core, do they get hot?
Suspect your thermostat has a bypass, so even a closed thermostat
shouldn't cause loss of heat. I would think a bad water pump would
cause engine overheat unless it is extremely cold.
Got any fluid flow in the radiator?
You could temporarily pull the hose at the heater inlet and see if you
get flow [into a big container].
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
Does the temperature guage show the engine is getting hot?
Coolant nice and fresh or all crudded up?
If you check the hoses going to the heater core, do they get hot?
Suspect your thermostat has a bypass, so even a closed thermostat
shouldn't cause loss of heat. I would think a bad water pump would
cause engine overheat unless it is extremely cold.
Got any fluid flow in the radiator?
You could temporarily pull the hose at the heater inlet and see if you
get flow [into a big container].
01-31-2007, 08:58 AM
#14
Guest
Posts: n/a
Re: Cherokee Heating problem
On Jan 30, 6:25 pm, "Nightcheck" <Nightch...@***.net> wrote:
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
>
> Rick
First) The heater hoses WILL be hot all the way to the "Heater Control
Valve" located toward the rear of the engine compartment whether or
not the valve is working because it has a "Circulate" feature.
Second) The easiest and least expensive part to change is the "Heater
Control Valve", and it should be changed periodically anyway.
Third) There is a vacuum actuator hose that operates the "HCV", check
to see if the valve's control arm moves when you change the setting on
the dash from OFF to HEAT and move the slider from HOT to COLD. Do
this several times with the ENGINE RUNNING to provide a source of
vacuum. If the valve does not move, pull off the tiny hose and perform
the same test again while feeling for vacuum at the hose end. If you
can not detect any vacuum, the "Control Head" on the dash could be the
problem or you may not be getting any vacuum from the engine to that
"Control Head". If the that is the case, make sure you are getting a
vacuum supply to the "CH" before spending money.
Fourth) Sadly, your local "Dealer" appears to be CROOKED. Avoid them
in the future, they will eventually go away.
Best bet is to find Two (2) VERY reputable independant shops and get a
second opinion. You didn't say where you were located, but looking
online for a site the rates shops is sometimes a good thing.
Diagnosing this problem would take about 5 minutes for someone
familiar with the Cherokee, I have had my 1995 since new and took the
time to learn all of its systems and have done all of the repair work
myself.
Good luck!
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
>
> Rick
First) The heater hoses WILL be hot all the way to the "Heater Control
Valve" located toward the rear of the engine compartment whether or
not the valve is working because it has a "Circulate" feature.
Second) The easiest and least expensive part to change is the "Heater
Control Valve", and it should be changed periodically anyway.
Third) There is a vacuum actuator hose that operates the "HCV", check
to see if the valve's control arm moves when you change the setting on
the dash from OFF to HEAT and move the slider from HOT to COLD. Do
this several times with the ENGINE RUNNING to provide a source of
vacuum. If the valve does not move, pull off the tiny hose and perform
the same test again while feeling for vacuum at the hose end. If you
can not detect any vacuum, the "Control Head" on the dash could be the
problem or you may not be getting any vacuum from the engine to that
"Control Head". If the that is the case, make sure you are getting a
vacuum supply to the "CH" before spending money.
Fourth) Sadly, your local "Dealer" appears to be CROOKED. Avoid them
in the future, they will eventually go away.
Best bet is to find Two (2) VERY reputable independant shops and get a
second opinion. You didn't say where you were located, but looking
online for a site the rates shops is sometimes a good thing.
Diagnosing this problem would take about 5 minutes for someone
familiar with the Cherokee, I have had my 1995 since new and took the
time to learn all of its systems and have done all of the repair work
myself.
Good luck!
01-31-2007, 08:58 AM
#15
Guest
Posts: n/a
Re: Cherokee Heating problem
On Jan 30, 6:25 pm, "Nightcheck" <Nightch...@***.net> wrote:
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
>
> Rick
First) The heater hoses WILL be hot all the way to the "Heater Control
Valve" located toward the rear of the engine compartment whether or
not the valve is working because it has a "Circulate" feature.
Second) The easiest and least expensive part to change is the "Heater
Control Valve", and it should be changed periodically anyway.
Third) There is a vacuum actuator hose that operates the "HCV", check
to see if the valve's control arm moves when you change the setting on
the dash from OFF to HEAT and move the slider from HOT to COLD. Do
this several times with the ENGINE RUNNING to provide a source of
vacuum. If the valve does not move, pull off the tiny hose and perform
the same test again while feeling for vacuum at the hose end. If you
can not detect any vacuum, the "Control Head" on the dash could be the
problem or you may not be getting any vacuum from the engine to that
"Control Head". If the that is the case, make sure you are getting a
vacuum supply to the "CH" before spending money.
Fourth) Sadly, your local "Dealer" appears to be CROOKED. Avoid them
in the future, they will eventually go away.
Best bet is to find Two (2) VERY reputable independant shops and get a
second opinion. You didn't say where you were located, but looking
online for a site the rates shops is sometimes a good thing.
Diagnosing this problem would take about 5 minutes for someone
familiar with the Cherokee, I have had my 1995 since new and took the
time to learn all of its systems and have done all of the repair work
myself.
Good luck!
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
>
> Rick
First) The heater hoses WILL be hot all the way to the "Heater Control
Valve" located toward the rear of the engine compartment whether or
not the valve is working because it has a "Circulate" feature.
Second) The easiest and least expensive part to change is the "Heater
Control Valve", and it should be changed periodically anyway.
Third) There is a vacuum actuator hose that operates the "HCV", check
to see if the valve's control arm moves when you change the setting on
the dash from OFF to HEAT and move the slider from HOT to COLD. Do
this several times with the ENGINE RUNNING to provide a source of
vacuum. If the valve does not move, pull off the tiny hose and perform
the same test again while feeling for vacuum at the hose end. If you
can not detect any vacuum, the "Control Head" on the dash could be the
problem or you may not be getting any vacuum from the engine to that
"Control Head". If the that is the case, make sure you are getting a
vacuum supply to the "CH" before spending money.
Fourth) Sadly, your local "Dealer" appears to be CROOKED. Avoid them
in the future, they will eventually go away.
Best bet is to find Two (2) VERY reputable independant shops and get a
second opinion. You didn't say where you were located, but looking
online for a site the rates shops is sometimes a good thing.
Diagnosing this problem would take about 5 minutes for someone
familiar with the Cherokee, I have had my 1995 since new and took the
time to learn all of its systems and have done all of the repair work
myself.
Good luck!
01-31-2007, 08:58 AM
#16
Guest
Posts: n/a
Re: Cherokee Heating problem
On Jan 30, 6:25 pm, "Nightcheck" <Nightch...@***.net> wrote:
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
>
> Rick
First) The heater hoses WILL be hot all the way to the "Heater Control
Valve" located toward the rear of the engine compartment whether or
not the valve is working because it has a "Circulate" feature.
Second) The easiest and least expensive part to change is the "Heater
Control Valve", and it should be changed periodically anyway.
Third) There is a vacuum actuator hose that operates the "HCV", check
to see if the valve's control arm moves when you change the setting on
the dash from OFF to HEAT and move the slider from HOT to COLD. Do
this several times with the ENGINE RUNNING to provide a source of
vacuum. If the valve does not move, pull off the tiny hose and perform
the same test again while feeling for vacuum at the hose end. If you
can not detect any vacuum, the "Control Head" on the dash could be the
problem or you may not be getting any vacuum from the engine to that
"Control Head". If the that is the case, make sure you are getting a
vacuum supply to the "CH" before spending money.
Fourth) Sadly, your local "Dealer" appears to be CROOKED. Avoid them
in the future, they will eventually go away.
Best bet is to find Two (2) VERY reputable independant shops and get a
second opinion. You didn't say where you were located, but looking
online for a site the rates shops is sometimes a good thing.
Diagnosing this problem would take about 5 minutes for someone
familiar with the Cherokee, I have had my 1995 since new and took the
time to learn all of its systems and have done all of the repair work
myself.
Good luck!
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
>
> Rick
First) The heater hoses WILL be hot all the way to the "Heater Control
Valve" located toward the rear of the engine compartment whether or
not the valve is working because it has a "Circulate" feature.
Second) The easiest and least expensive part to change is the "Heater
Control Valve", and it should be changed periodically anyway.
Third) There is a vacuum actuator hose that operates the "HCV", check
to see if the valve's control arm moves when you change the setting on
the dash from OFF to HEAT and move the slider from HOT to COLD. Do
this several times with the ENGINE RUNNING to provide a source of
vacuum. If the valve does not move, pull off the tiny hose and perform
the same test again while feeling for vacuum at the hose end. If you
can not detect any vacuum, the "Control Head" on the dash could be the
problem or you may not be getting any vacuum from the engine to that
"Control Head". If the that is the case, make sure you are getting a
vacuum supply to the "CH" before spending money.
Fourth) Sadly, your local "Dealer" appears to be CROOKED. Avoid them
in the future, they will eventually go away.
Best bet is to find Two (2) VERY reputable independant shops and get a
second opinion. You didn't say where you were located, but looking
online for a site the rates shops is sometimes a good thing.
Diagnosing this problem would take about 5 minutes for someone
familiar with the Cherokee, I have had my 1995 since new and took the
time to learn all of its systems and have done all of the repair work
myself.
Good luck!
01-31-2007, 08:58 AM
#17
Guest
Posts: n/a
Re: Cherokee Heating problem
On Jan 30, 6:25 pm, "Nightcheck" <Nightch...@***.net> wrote:
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
>
> Rick
First) The heater hoses WILL be hot all the way to the "Heater Control
Valve" located toward the rear of the engine compartment whether or
not the valve is working because it has a "Circulate" feature.
Second) The easiest and least expensive part to change is the "Heater
Control Valve", and it should be changed periodically anyway.
Third) There is a vacuum actuator hose that operates the "HCV", check
to see if the valve's control arm moves when you change the setting on
the dash from OFF to HEAT and move the slider from HOT to COLD. Do
this several times with the ENGINE RUNNING to provide a source of
vacuum. If the valve does not move, pull off the tiny hose and perform
the same test again while feeling for vacuum at the hose end. If you
can not detect any vacuum, the "Control Head" on the dash could be the
problem or you may not be getting any vacuum from the engine to that
"Control Head". If the that is the case, make sure you are getting a
vacuum supply to the "CH" before spending money.
Fourth) Sadly, your local "Dealer" appears to be CROOKED. Avoid them
in the future, they will eventually go away.
Best bet is to find Two (2) VERY reputable independant shops and get a
second opinion. You didn't say where you were located, but looking
online for a site the rates shops is sometimes a good thing.
Diagnosing this problem would take about 5 minutes for someone
familiar with the Cherokee, I have had my 1995 since new and took the
time to learn all of its systems and have done all of the repair work
myself.
Good luck!
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
>
> Rick
First) The heater hoses WILL be hot all the way to the "Heater Control
Valve" located toward the rear of the engine compartment whether or
not the valve is working because it has a "Circulate" feature.
Second) The easiest and least expensive part to change is the "Heater
Control Valve", and it should be changed periodically anyway.
Third) There is a vacuum actuator hose that operates the "HCV", check
to see if the valve's control arm moves when you change the setting on
the dash from OFF to HEAT and move the slider from HOT to COLD. Do
this several times with the ENGINE RUNNING to provide a source of
vacuum. If the valve does not move, pull off the tiny hose and perform
the same test again while feeling for vacuum at the hose end. If you
can not detect any vacuum, the "Control Head" on the dash could be the
problem or you may not be getting any vacuum from the engine to that
"Control Head". If the that is the case, make sure you are getting a
vacuum supply to the "CH" before spending money.
Fourth) Sadly, your local "Dealer" appears to be CROOKED. Avoid them
in the future, they will eventually go away.
Best bet is to find Two (2) VERY reputable independant shops and get a
second opinion. You didn't say where you were located, but looking
online for a site the rates shops is sometimes a good thing.
Diagnosing this problem would take about 5 minutes for someone
familiar with the Cherokee, I have had my 1995 since new and took the
time to learn all of its systems and have done all of the repair work
myself.
Good luck!
01-31-2007, 06:27 PM
#18
Guest
Posts: n/a
Re: Cherokee Heating problem
If the core is clogged with sediment, an easy way to blow it out is with
your 5/8" garden hose clamped to the back flush side, letting it exit
through the disconnected hose at thermostat. I've seen that work a couple of
times on what I thought was a well maintained cooling system.
God Bless America, Bill 0|||||||0
mailto:-------------------- http://www.----------.com/
"Nightcheck" <Nightcheck@***.net> wrote in message
news:1170203137.781487.307450@h3g2000cwc.googlegro ups.com...
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
>
> Rick
>
your 5/8" garden hose clamped to the back flush side, letting it exit
through the disconnected hose at thermostat. I've seen that work a couple of
times on what I thought was a well maintained cooling system.
God Bless America, Bill 0|||||||0
mailto:-------------------- http://www.----------.com/
"Nightcheck" <Nightcheck@***.net> wrote in message
news:1170203137.781487.307450@h3g2000cwc.googlegro ups.com...
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
>
> Rick
>
01-31-2007, 06:27 PM
#19
Guest
Posts: n/a
Re: Cherokee Heating problem
If the core is clogged with sediment, an easy way to blow it out is with
your 5/8" garden hose clamped to the back flush side, letting it exit
through the disconnected hose at thermostat. I've seen that work a couple of
times on what I thought was a well maintained cooling system.
God Bless America, Bill 0|||||||0
mailto:-------------------- http://www.----------.com/
"Nightcheck" <Nightcheck@***.net> wrote in message
news:1170203137.781487.307450@h3g2000cwc.googlegro ups.com...
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
>
> Rick
>
your 5/8" garden hose clamped to the back flush side, letting it exit
through the disconnected hose at thermostat. I've seen that work a couple of
times on what I thought was a well maintained cooling system.
God Bless America, Bill 0|||||||0
mailto:-------------------- http://www.----------.com/
"Nightcheck" <Nightcheck@***.net> wrote in message
news:1170203137.781487.307450@h3g2000cwc.googlegro ups.com...
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
>
> Rick
>
01-31-2007, 06:27 PM
#20
Guest
Posts: n/a
Re: Cherokee Heating problem
If the core is clogged with sediment, an easy way to blow it out is with
your 5/8" garden hose clamped to the back flush side, letting it exit
through the disconnected hose at thermostat. I've seen that work a couple of
times on what I thought was a well maintained cooling system.
God Bless America, Bill 0|||||||0
mailto:-------------------- http://www.----------.com/
"Nightcheck" <Nightcheck@***.net> wrote in message
news:1170203137.781487.307450@h3g2000cwc.googlegro ups.com...
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
>
> Rick
>
your 5/8" garden hose clamped to the back flush side, letting it exit
through the disconnected hose at thermostat. I've seen that work a couple of
times on what I thought was a well maintained cooling system.
God Bless America, Bill 0|||||||0
mailto:-------------------- http://www.----------.com/
"Nightcheck" <Nightcheck@***.net> wrote in message
news:1170203137.781487.307450@h3g2000cwc.googlegro ups.com...
> Hi -
>
> My son has a 1994 Jeep Cherokee and the heater has stopped blowing
> warm air. The A/C works fine; however, when he switches it to "heat" -
> only cool air comes out.
>
> There doesn't appear to be any leak in the Heater Core - Since I'm
> not sure if any fuses control the heater - I checked all of them since
> I couldn't find a schematic or diagram listing what each fuse is for -
> but all the fuses are fine.
>
> He took it to a dealer for an estimate - they quickly said it was
> probably the water pump, hoses, T-Stat and would cost about $700.
>
> I know next to nothing about auto repairs except what i have
> experienced in the cars I have owned over the years - but it strikes
> me as odd that we never saw any water or any other liquid leaking
> which perplexes me a bit if they said the water pump was leaking - and
> I also don't understand the connection between the water pump and
> heater. Since the A/C works fine - and the heater blows air - just
> cool and not warm/hot - It's a bit confusing for me.
>
> Does it sound reasonable what the dealership claims is the problem -
> if so, does their quote seem reasonable? - and if it isn't a "leaky"
> water pump - any ideas on that the problem could be?
>
> Thanks so much in advance and will rely on your input to determine
> if he should take it back to the dealer for the new water pump -
> or ????
>
> Rick
>
