Someone mentioned that the thermostat is supposed to go in 'backwards'
on this engines setup??? If the installer isn't aware of this.....

Inside heat can be deceiving. Most engines have a thermostat bypass so
hot coolant can get to the heater core before the thermostat opens.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Carl wrote:
> Good point. Do you have heat? If you do, it's the radiator.
>
> Carl
>
> "dave AKA vwdoc1" <vwdoc1@hotmail.com> wrote in message
> news:DdDqh.16038$Gw4.14114@newssvr23.news.prodigy. net...
>> Wouldn't a bad water pump that causes a "NO-FLOW" situation also cause no
>> heat in the cabin?
>> James are you freezing inside of the Jeep or do you have fantastic heat?
>>
>> The answer should help you guess if it is the water pump causing your
>> problem(s) or the thermostat and/or radiator.
>> Whoever installed the thermostat should check your system out for you!
>> ;-)
>>
>> If you are getting good heat inside the Jeep, I guess I would start with
>> another thermostat also. Make sure it is a good brand!!
>>
>> I worked on a vehicle that had a defective oil cooler. This allowed oil
>> into the coolant system and everything turned into a very thick paste-like
>> crud. It clogged up the radiator hoses, heater core and the radiator
>> causing the engine to overheat. I don't think that this is your problem.
>> 8^o
>> http://vwdoc1.tripod.com/oil_cooler_failure.html
>>
>> good luck!
>> later,
>> dave AKA vwdoc1
>>
>>
>
>

 

James wrote:
I let the engine run for 45 minutes. The gauge went to 205 and stayed
there. At no time did I see a water flow, even after 45 minutes of running
at idle. I put my finger in the water and it was **warm** but not at all
hot. Just warm. It never got hot.

Mike Roman responded:
I let the engine run for 45 minutes. The gauge went to 205 and stayed
there. At no time did I see a water flow, even after 45 minutes of running
at idle. I put my finger in the water and it was **warm** but not at all
hot. Just warm. It never got hot.


I still think it would be good to verify the temp guage is really showing
the correct temp. Where is the temp sensor that the guage could read >200
and the coolant not burn a finger?

But then, what do I know? I have not worked on my on vehicles for years...

Regards,
doug


"Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
news:isqdnZN7p-txfDfYnZ2dnUVZ_vWtnZ2d@comcast.com...
> James,
>
> My money is on a bad water pump, thermostat, or clogged radiator. No
> coolant flow in the radiator at idle when warm could only be one of the
> three. Pull the upper and lower rad hoses and flush it with a garden hose,
> or just pull the radiator and have it cleaned and re-cored. While it's off
> replace the water pump, and thermostat (yes, do it again), flush the
> entire system and watch your cooling troubles go away.
>
> Hope this helps,
>
> Carl
>
>
> "James" <jnipperxxx@nospamfdn.com> wrote in message
> news:X82dnXCaIdETmTTYnZ2dnUVZ_umlnZ2d@comcast.com. ..
>>I posted this several weeks ago, and got a lot of thoughtful replies. No
>> remedy yet, this is just an update.
>>
>> Last week, I drove home from vacation, a 500 mile trip. I noticed
>> repeatedly that the temp at 65 mph would be in the 205-210 range, but
>> five
>> minutes after I go up to 75 mph, the temp would increase to around 225.
>> I
>> did this test over and over, and got the same results.
>>
>> Someone suggested that to check the (new) thermostat, to take the
>> pressure
>> cap off when the engine is cold, start the engine, and see if there is
>> water
>> flow (I assume there should be flow after the thermostat opens up). I
>> did
>> this test, while the outside temp is 72 degrees. From the first
>> engine
>> start, I saw no water flow. None.
>>
>> I let the engine run for 45 minutes. The gauge went to 205 and
>> stayed
>> there. At no time did I see a water flow, even after 45 minutes of
>> running
>> at idle. I put my finger in the water and it was **warm** but not at
>> all
>> hot. Just warm. It never got hot.
>>
>> Should I have seen water flow after the temp went to 205, and the
>> engine
>> ran for 45 mins ??
>>
>>
>> Any further comments will be appreciated.
>>
>>
>>
>> --James--
>>
>>
>>
>>
>> ----------------------------------------------------------------------------
>> -------------------------------
>>
>> This is a V-8, 120 K miles. It usually runs around 200-210
>>> degrees. During last six months or so, it will go up the 235 degrees
>>> when
>>> traveling over 70 mph. It will also do this when going up a medium
>>> incline, even at very slow speed.
>>>
>>> It stays 100% normal at slow speeds, and at idle, such as at a traffic
>>> light.
>>>
>>> Fan clutch was replaced fairly recently, that DID relate to heating
>>> some
>>> at idle.
>>>
>>> I am thinking either I need radiator work or a new radiator OR that I
>>> may have a bad thermostat. I suppose I could also have a defective
>>> water pump at high speeds, but that wouldn't explain why it overheats on
>>> medium inclines even at slow speeds.
>>>
>>> BTW, some folks may say 235 degrees is normal under some circumstances.
>>> I
>>> can assure you that this is NOT normal, as I have driven this car for
>>> six
>>> years and I know how it performs.
>>>
>>> What is most likely culprit? Themostat/Water Pump/Radiator
>>>
>>> If it is radiator, is it worth it to have it re-rodded, or is it best
>>> just
>>> to install a new radiator?
>>>
>>> As a non-mechanic, are these any tests I can do to narrow it down more?
>>> (Water pump does not leak).
>>>
>>>
>>> Thanks for any tips !!!
>>>
>>> --James--
>>
>>
>
>

 

James wrote:
I let the engine run for 45 minutes. The gauge went to 205 and stayed
there. At no time did I see a water flow, even after 45 minutes of running
at idle. I put my finger in the water and it was **warm** but not at all
hot. Just warm. It never got hot.

Mike Roman responded:
I let the engine run for 45 minutes. The gauge went to 205 and stayed
there. At no time did I see a water flow, even after 45 minutes of running
at idle. I put my finger in the water and it was **warm** but not at all
hot. Just warm. It never got hot.


I still think it would be good to verify the temp guage is really showing
the correct temp. Where is the temp sensor that the guage could read >200
and the coolant not burn a finger?

But then, what do I know? I have not worked on my on vehicles for years...

Regards,
doug


"Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
news:isqdnZN7p-txfDfYnZ2dnUVZ_vWtnZ2d@comcast.com...
> James,
>
> My money is on a bad water pump, thermostat, or clogged radiator. No
> coolant flow in the radiator at idle when warm could only be one of the
> three. Pull the upper and lower rad hoses and flush it with a garden hose,
> or just pull the radiator and have it cleaned and re-cored. While it's off
> replace the water pump, and thermostat (yes, do it again), flush the
> entire system and watch your cooling troubles go away.
>
> Hope this helps,
>
> Carl
>
>
> "James" <jnipperxxx@nospamfdn.com> wrote in message
> news:X82dnXCaIdETmTTYnZ2dnUVZ_umlnZ2d@comcast.com. ..
>>I posted this several weeks ago, and got a lot of thoughtful replies. No
>> remedy yet, this is just an update.
>>
>> Last week, I drove home from vacation, a 500 mile trip. I noticed
>> repeatedly that the temp at 65 mph would be in the 205-210 range, but
>> five
>> minutes after I go up to 75 mph, the temp would increase to around 225.
>> I
>> did this test over and over, and got the same results.
>>
>> Someone suggested that to check the (new) thermostat, to take the
>> pressure
>> cap off when the engine is cold, start the engine, and see if there is
>> water
>> flow (I assume there should be flow after the thermostat opens up). I
>> did
>> this test, while the outside temp is 72 degrees. From the first
>> engine
>> start, I saw no water flow. None.
>>
>> I let the engine run for 45 minutes. The gauge went to 205 and
>> stayed
>> there. At no time did I see a water flow, even after 45 minutes of
>> running
>> at idle. I put my finger in the water and it was **warm** but not at
>> all
>> hot. Just warm. It never got hot.
>>
>> Should I have seen water flow after the temp went to 205, and the
>> engine
>> ran for 45 mins ??
>>
>>
>> Any further comments will be appreciated.
>>
>>
>>
>> --James--
>>
>>
>>
>>
>> ----------------------------------------------------------------------------
>> -------------------------------
>>
>> This is a V-8, 120 K miles. It usually runs around 200-210
>>> degrees. During last six months or so, it will go up the 235 degrees
>>> when
>>> traveling over 70 mph. It will also do this when going up a medium
>>> incline, even at very slow speed.
>>>
>>> It stays 100% normal at slow speeds, and at idle, such as at a traffic
>>> light.
>>>
>>> Fan clutch was replaced fairly recently, that DID relate to heating
>>> some
>>> at idle.
>>>
>>> I am thinking either I need radiator work or a new radiator OR that I
>>> may have a bad thermostat. I suppose I could also have a defective
>>> water pump at high speeds, but that wouldn't explain why it overheats on
>>> medium inclines even at slow speeds.
>>>
>>> BTW, some folks may say 235 degrees is normal under some circumstances.
>>> I
>>> can assure you that this is NOT normal, as I have driven this car for
>>> six
>>> years and I know how it performs.
>>>
>>> What is most likely culprit? Themostat/Water Pump/Radiator
>>>
>>> If it is radiator, is it worth it to have it re-rodded, or is it best
>>> just
>>> to install a new radiator?
>>>
>>> As a non-mechanic, are these any tests I can do to narrow it down more?
>>> (Water pump does not leak).
>>>
>>>
>>> Thanks for any tips !!!
>>>
>>> --James--
>>
>>
>
>

 

James wrote:
I let the engine run for 45 minutes. The gauge went to 205 and stayed
there. At no time did I see a water flow, even after 45 minutes of running
at idle. I put my finger in the water and it was **warm** but not at all
hot. Just warm. It never got hot.

Mike Roman responded:
I let the engine run for 45 minutes. The gauge went to 205 and stayed
there. At no time did I see a water flow, even after 45 minutes of running
at idle. I put my finger in the water and it was **warm** but not at all
hot. Just warm. It never got hot.


I still think it would be good to verify the temp guage is really showing
the correct temp. Where is the temp sensor that the guage could read >200
and the coolant not burn a finger?

But then, what do I know? I have not worked on my on vehicles for years...

Regards,
doug


"Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
news:isqdnZN7p-txfDfYnZ2dnUVZ_vWtnZ2d@comcast.com...
> James,
>
> My money is on a bad water pump, thermostat, or clogged radiator. No
> coolant flow in the radiator at idle when warm could only be one of the
> three. Pull the upper and lower rad hoses and flush it with a garden hose,
> or just pull the radiator and have it cleaned and re-cored. While it's off
> replace the water pump, and thermostat (yes, do it again), flush the
> entire system and watch your cooling troubles go away.
>
> Hope this helps,
>
> Carl
>
>
> "James" <jnipperxxx@nospamfdn.com> wrote in message
> news:X82dnXCaIdETmTTYnZ2dnUVZ_umlnZ2d@comcast.com. ..
>>I posted this several weeks ago, and got a lot of thoughtful replies. No
>> remedy yet, this is just an update.
>>
>> Last week, I drove home from vacation, a 500 mile trip. I noticed
>> repeatedly that the temp at 65 mph would be in the 205-210 range, but
>> five
>> minutes after I go up to 75 mph, the temp would increase to around 225.
>> I
>> did this test over and over, and got the same results.
>>
>> Someone suggested that to check the (new) thermostat, to take the
>> pressure
>> cap off when the engine is cold, start the engine, and see if there is
>> water
>> flow (I assume there should be flow after the thermostat opens up). I
>> did
>> this test, while the outside temp is 72 degrees. From the first
>> engine
>> start, I saw no water flow. None.
>>
>> I let the engine run for 45 minutes. The gauge went to 205 and
>> stayed
>> there. At no time did I see a water flow, even after 45 minutes of
>> running
>> at idle. I put my finger in the water and it was **warm** but not at
>> all
>> hot. Just warm. It never got hot.
>>
>> Should I have seen water flow after the temp went to 205, and the
>> engine
>> ran for 45 mins ??
>>
>>
>> Any further comments will be appreciated.
>>
>>
>>
>> --James--
>>
>>
>>
>>
>> ----------------------------------------------------------------------------
>> -------------------------------
>>
>> This is a V-8, 120 K miles. It usually runs around 200-210
>>> degrees. During last six months or so, it will go up the 235 degrees
>>> when
>>> traveling over 70 mph. It will also do this when going up a medium
>>> incline, even at very slow speed.
>>>
>>> It stays 100% normal at slow speeds, and at idle, such as at a traffic
>>> light.
>>>
>>> Fan clutch was replaced fairly recently, that DID relate to heating
>>> some
>>> at idle.
>>>
>>> I am thinking either I need radiator work or a new radiator OR that I
>>> may have a bad thermostat. I suppose I could also have a defective
>>> water pump at high speeds, but that wouldn't explain why it overheats on
>>> medium inclines even at slow speeds.
>>>
>>> BTW, some folks may say 235 degrees is normal under some circumstances.
>>> I
>>> can assure you that this is NOT normal, as I have driven this car for
>>> six
>>> years and I know how it performs.
>>>
>>> What is most likely culprit? Themostat/Water Pump/Radiator
>>>
>>> If it is radiator, is it worth it to have it re-rodded, or is it best
>>> just
>>> to install a new radiator?
>>>
>>> As a non-mechanic, are these any tests I can do to narrow it down more?
>>> (Water pump does not leak).
>>>
>>>
>>> Thanks for any tips !!!
>>>
>>> --James--
>>
>>
>
>

 

James wrote:
I let the engine run for 45 minutes. The gauge went to 205 and stayed
there. At no time did I see a water flow, even after 45 minutes of running
at idle. I put my finger in the water and it was **warm** but not at all
hot. Just warm. It never got hot.

Mike Roman responded:
I let the engine run for 45 minutes. The gauge went to 205 and stayed
there. At no time did I see a water flow, even after 45 minutes of running
at idle. I put my finger in the water and it was **warm** but not at all
hot. Just warm. It never got hot.


I still think it would be good to verify the temp guage is really showing
the correct temp. Where is the temp sensor that the guage could read >200
and the coolant not burn a finger?

But then, what do I know? I have not worked on my on vehicles for years...

Regards,
doug


"Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
news:isqdnZN7p-txfDfYnZ2dnUVZ_vWtnZ2d@comcast.com...
> James,
>
> My money is on a bad water pump, thermostat, or clogged radiator. No
> coolant flow in the radiator at idle when warm could only be one of the
> three. Pull the upper and lower rad hoses and flush it with a garden hose,
> or just pull the radiator and have it cleaned and re-cored. While it's off
> replace the water pump, and thermostat (yes, do it again), flush the
> entire system and watch your cooling troubles go away.
>
> Hope this helps,
>
> Carl
>
>
> "James" <jnipperxxx@nospamfdn.com> wrote in message
> news:X82dnXCaIdETmTTYnZ2dnUVZ_umlnZ2d@comcast.com. ..
>>I posted this several weeks ago, and got a lot of thoughtful replies. No
>> remedy yet, this is just an update.
>>
>> Last week, I drove home from vacation, a 500 mile trip. I noticed
>> repeatedly that the temp at 65 mph would be in the 205-210 range, but
>> five
>> minutes after I go up to 75 mph, the temp would increase to around 225.
>> I
>> did this test over and over, and got the same results.
>>
>> Someone suggested that to check the (new) thermostat, to take the
>> pressure
>> cap off when the engine is cold, start the engine, and see if there is
>> water
>> flow (I assume there should be flow after the thermostat opens up). I
>> did
>> this test, while the outside temp is 72 degrees. From the first
>> engine
>> start, I saw no water flow. None.
>>
>> I let the engine run for 45 minutes. The gauge went to 205 and
>> stayed
>> there. At no time did I see a water flow, even after 45 minutes of
>> running
>> at idle. I put my finger in the water and it was **warm** but not at
>> all
>> hot. Just warm. It never got hot.
>>
>> Should I have seen water flow after the temp went to 205, and the
>> engine
>> ran for 45 mins ??
>>
>>
>> Any further comments will be appreciated.
>>
>>
>>
>> --James--
>>
>>
>>
>>
>> ----------------------------------------------------------------------------
>> -------------------------------
>>
>> This is a V-8, 120 K miles. It usually runs around 200-210
>>> degrees. During last six months or so, it will go up the 235 degrees
>>> when
>>> traveling over 70 mph. It will also do this when going up a medium
>>> incline, even at very slow speed.
>>>
>>> It stays 100% normal at slow speeds, and at idle, such as at a traffic
>>> light.
>>>
>>> Fan clutch was replaced fairly recently, that DID relate to heating
>>> some
>>> at idle.
>>>
>>> I am thinking either I need radiator work or a new radiator OR that I
>>> may have a bad thermostat. I suppose I could also have a defective
>>> water pump at high speeds, but that wouldn't explain why it overheats on
>>> medium inclines even at slow speeds.
>>>
>>> BTW, some folks may say 235 degrees is normal under some circumstances.
>>> I
>>> can assure you that this is NOT normal, as I have driven this car for
>>> six
>>> years and I know how it performs.
>>>
>>> What is most likely culprit? Themostat/Water Pump/Radiator
>>>
>>> If it is radiator, is it worth it to have it re-rodded, or is it best
>>> just
>>> to install a new radiator?
>>>
>>> As a non-mechanic, are these any tests I can do to narrow it down more?
>>> (Water pump does not leak).
>>>
>>>
>>> Thanks for any tips !!!
>>>
>>> --James--
>>
>>
>
>

 

On Mon, 15 Jan 2007 11:56:00 -0500, Mike Romain <romainm@sympatico.ca>
wrote:

> Most engines have a thermostat bypass so
>hot coolant can get to the heater core before the thermostat opens.


I am not aware of any that do not bypass Tstat for heater. It would be
kinda silly not to.
-----------------
TheSnoMan.com

 

On Mon, 15 Jan 2007 11:56:00 -0500, Mike Romain <romainm@sympatico.ca>
wrote:

> Most engines have a thermostat bypass so
>hot coolant can get to the heater core before the thermostat opens.


I am not aware of any that do not bypass Tstat for heater. It would be
kinda silly not to.
-----------------
TheSnoMan.com

 

On Mon, 15 Jan 2007 11:56:00 -0500, Mike Romain <romainm@sympatico.ca>
wrote:

> Most engines have a thermostat bypass so
>hot coolant can get to the heater core before the thermostat opens.


I am not aware of any that do not bypass Tstat for heater. It would be
kinda silly not to.
-----------------
TheSnoMan.com

 

On Mon, 15 Jan 2007 11:56:00 -0500, Mike Romain <romainm@sympatico.ca>
wrote:

> Most engines have a thermostat bypass so
>hot coolant can get to the heater core before the thermostat opens.


I am not aware of any that do not bypass Tstat for heater. It would be
kinda silly not to.
-----------------
TheSnoMan.com

 

No flow is only caused by four things. Clogged radiator, clogged block, bad
t-stat, bad water pump. Tell us if the heat is working. If it works well,
it's the radiator.

Carl


"Doug" <nono@nono.com> wrote in message
news:wJidnd5To_1CITbYnZ2dnUVZ_tWhnZ2d@comcast.com. ..
> James wrote:
> I let the engine run for 45 minutes. The gauge went to 205 and stayed
> there. At no time did I see a water flow, even after 45 minutes of
> running
> at idle. I put my finger in the water and it was **warm** but not at
> all
> hot. Just warm. It never got hot.
>
> Mike Roman responded:
> I let the engine run for 45 minutes. The gauge went to 205 and stayed
> there. At no time did I see a water flow, even after 45 minutes of
> running
> at idle. I put my finger in the water and it was **warm** but not at
> all
> hot. Just warm. It never got hot.
>
>
> I still think it would be good to verify the temp guage is really showing
> the correct temp. Where is the temp sensor that the guage could read >200
> and the coolant not burn a finger?
>
> But then, what do I know? I have not worked on my on vehicles for years...
>
> Regards,
> doug
>
>
> "Carl" <carlsaiyed@hotmailREMOVE.com> wrote in message
> news:isqdnZN7p-txfDfYnZ2dnUVZ_vWtnZ2d@comcast.com...
>> James,
>>
>> My money is on a bad water pump, thermostat, or clogged radiator. No
>> coolant flow in the radiator at idle when warm could only be one of the
>> three. Pull the upper and lower rad hoses and flush it with a garden
>> hose, or just pull the radiator and have it cleaned and re-cored. While
>> it's off replace the water pump, and thermostat (yes, do it again), flush
>> the entire system and watch your cooling troubles go away.
>>
>> Hope this helps,
>>
>> Carl
>>
>>
>> "James" <jnipperxxx@nospamfdn.com> wrote in message
>> news:X82dnXCaIdETmTTYnZ2dnUVZ_umlnZ2d@comcast.com. ..
>>>I posted this several weeks ago, and got a lot of thoughtful replies.
>>>No
>>> remedy yet, this is just an update.
>>>
>>> Last week, I drove home from vacation, a 500 mile trip. I noticed
>>> repeatedly that the temp at 65 mph would be in the 205-210 range, but
>>> five
>>> minutes after I go up to 75 mph, the temp would increase to around 225.
>>> I
>>> did this test over and over, and got the same results.
>>>
>>> Someone suggested that to check the (new) thermostat, to take the
>>> pressure
>>> cap off when the engine is cold, start the engine, and see if there is
>>> water
>>> flow (I assume there should be flow after the thermostat opens up). I
>>> did
>>> this test, while the outside temp is 72 degrees. From the first
>>> engine
>>> start, I saw no water flow. None.
>>>
>>> I let the engine run for 45 minutes. The gauge went to 205 and
>>> stayed
>>> there. At no time did I see a water flow, even after 45 minutes of
>>> running
>>> at idle. I put my finger in the water and it was **warm** but not at
>>> all
>>> hot. Just warm. It never got hot.
>>>
>>> Should I have seen water flow after the temp went to 205, and the
>>> engine
>>> ran for 45 mins ??
>>>
>>>
>>> Any further comments will be appreciated.
>>>
>>>
>>>
>>> --James--
>>>
>>>
>>>
>>>
>>> ----------------------------------------------------------------------------
>>> -------------------------------
>>>
>>> This is a V-8, 120 K miles. It usually runs around 200-210
>>>> degrees. During last six months or so, it will go up the 235 degrees
>>>> when
>>>> traveling over 70 mph. It will also do this when going up a medium
>>>> incline, even at very slow speed.
>>>>
>>>> It stays 100% normal at slow speeds, and at idle, such as at a traffic
>>>> light.
>>>>
>>>> Fan clutch was replaced fairly recently, that DID relate to heating
>>>> some
>>>> at idle.
>>>>
>>>> I am thinking either I need radiator work or a new radiator OR that I
>>>> may have a bad thermostat. I suppose I could also have a defective
>>>> water pump at high speeds, but that wouldn't explain why it overheats
>>>> on
>>>> medium inclines even at slow speeds.
>>>>
>>>> BTW, some folks may say 235 degrees is normal under some
>>>> circumstances. I
>>>> can assure you that this is NOT normal, as I have driven this car for
>>>> six
>>>> years and I know how it performs.
>>>>
>>>> What is most likely culprit? Themostat/Water Pump/Radiator
>>>>
>>>> If it is radiator, is it worth it to have it re-rodded, or is it best
>>>> just
>>>> to install a new radiator?
>>>>
>>>> As a non-mechanic, are these any tests I can do to narrow it down more?
>>>> (Water pump does not leak).
>>>>
>>>>
>>>> Thanks for any tips !!!
>>>>
>>>> --James--
>>>
>>>
>>
>>
>
>