YJ heater question prt. II
 

Would there be any negative implications to 'capping' the passenger side
heat duct?
90% of the time I drive alone and it has gotten to that time of year when
getting a little extra heat helps.
Does a higher temp thermostat make a 'big' difference? I currently have a
185.

tia
paul

Re: YJ heater question prt. II
 

I removed that floor heat redirector from mine (one screw, I think)
because it's an airflow restriction. Makes for a warmer cab.

Re: YJ heater question prt. II
 

I removed that floor heat redirector from mine (one screw, I think)
because it's an airflow restriction. Makes for a warmer cab.

Re: YJ heater question prt. II
 

I removed that floor heat redirector from mine (one screw, I think)
because it's an airflow restriction. Makes for a warmer cab.

Re: YJ heater question prt. II
 

The first thing you should do is check the level of the coolant in the
radiator. If it is low you won't get much heater output.

No it will cause no damage to divert more of the heater output to the
driver's side.

Check the heat control valve , if you have one, to be sure that it is fully
operational both opening and closing. Some are cable operated, some vacuum.

Check the heater hose routing, if the hoses have to go up too far that will
slow the coolant flow and trap a large air bubble.

With the engine warmed up is the radiator hot? If it remains cool then the
thermostat may be stuck open. A open thermostat will not allow the coolant
to warm up and therefore you will have poor heater output.

Why do you have a 185 degree thermostat? Was the engine overheating in the
past? Hotter running engines run more efficiently and produce less
pollution.

Have you used radiator/cooling system stop leak? If yes you may have
clogged up the heater core.

What did your coolant look like when you checked it in step 1? If it was
nasty looking the heater core may be clogged. Back flush the cooling system
and heater core.

Remove the thermostat and check it for proper operation by putting it in a
pan of water on the stove and heating it. It should open shortly before it
begins to boil. If not replace it with the proper temperature thermostat.
You will need to have a replacement thermostat gasket available ahead of
time. Be careful not to stress any plastic parts.

Back flush the heater core by removing the hoses and forcing water backwards
of the normal flow. Save the first couple gallons in a bucket, what does it
look like, how much comes out, is there good water flow?




"paul" <SPAMpdrapeau@wi.rr.com> wrote in message
news:YAoff.233$GG1.99@tornado.rdc-kc.rr.com...
> Would there be any negative implications to 'capping' the passenger side
> heat duct?
> 90% of the time I drive alone and it has gotten to that time of year when
> getting a little extra heat helps.
> Does a higher temp thermostat make a 'big' difference? I currently have a
> 185.
>
> tia
> paul
>

Re: YJ heater question prt. II
 

The first thing you should do is check the level of the coolant in the
radiator. If it is low you won't get much heater output.

No it will cause no damage to divert more of the heater output to the
driver's side.

Check the heat control valve , if you have one, to be sure that it is fully
operational both opening and closing. Some are cable operated, some vacuum.

Check the heater hose routing, if the hoses have to go up too far that will
slow the coolant flow and trap a large air bubble.

With the engine warmed up is the radiator hot? If it remains cool then the
thermostat may be stuck open. A open thermostat will not allow the coolant
to warm up and therefore you will have poor heater output.

Why do you have a 185 degree thermostat? Was the engine overheating in the
past? Hotter running engines run more efficiently and produce less
pollution.

Have you used radiator/cooling system stop leak? If yes you may have
clogged up the heater core.

What did your coolant look like when you checked it in step 1? If it was
nasty looking the heater core may be clogged. Back flush the cooling system
and heater core.

Remove the thermostat and check it for proper operation by putting it in a
pan of water on the stove and heating it. It should open shortly before it
begins to boil. If not replace it with the proper temperature thermostat.
You will need to have a replacement thermostat gasket available ahead of
time. Be careful not to stress any plastic parts.

Back flush the heater core by removing the hoses and forcing water backwards
of the normal flow. Save the first couple gallons in a bucket, what does it
look like, how much comes out, is there good water flow?




"paul" <SPAMpdrapeau@wi.rr.com> wrote in message
news:YAoff.233$GG1.99@tornado.rdc-kc.rr.com...
> Would there be any negative implications to 'capping' the passenger side
> heat duct?
> 90% of the time I drive alone and it has gotten to that time of year when
> getting a little extra heat helps.
> Does a higher temp thermostat make a 'big' difference? I currently have a
> 185.
>
> tia
> paul
>

Re: YJ heater question prt. II
 

The first thing you should do is check the level of the coolant in the
radiator. If it is low you won't get much heater output.

No it will cause no damage to divert more of the heater output to the
driver's side.

Check the heat control valve , if you have one, to be sure that it is fully
operational both opening and closing. Some are cable operated, some vacuum.

Check the heater hose routing, if the hoses have to go up too far that will
slow the coolant flow and trap a large air bubble.

With the engine warmed up is the radiator hot? If it remains cool then the
thermostat may be stuck open. A open thermostat will not allow the coolant
to warm up and therefore you will have poor heater output.

Why do you have a 185 degree thermostat? Was the engine overheating in the
past? Hotter running engines run more efficiently and produce less
pollution.

Have you used radiator/cooling system stop leak? If yes you may have
clogged up the heater core.

What did your coolant look like when you checked it in step 1? If it was
nasty looking the heater core may be clogged. Back flush the cooling system
and heater core.

Remove the thermostat and check it for proper operation by putting it in a
pan of water on the stove and heating it. It should open shortly before it
begins to boil. If not replace it with the proper temperature thermostat.
You will need to have a replacement thermostat gasket available ahead of
time. Be careful not to stress any plastic parts.

Back flush the heater core by removing the hoses and forcing water backwards
of the normal flow. Save the first couple gallons in a bucket, what does it
look like, how much comes out, is there good water flow?




"paul" <SPAMpdrapeau@wi.rr.com> wrote in message
news:YAoff.233$GG1.99@tornado.rdc-kc.rr.com...
> Would there be any negative implications to 'capping' the passenger side
> heat duct?
> 90% of the time I drive alone and it has gotten to that time of year when
> getting a little extra heat helps.
> Does a higher temp thermostat make a 'big' difference? I currently have a
> 185.
>
> tia
> paul
>

Re: YJ heater question prt. II
 

The hotter t-stat does make a difference. Flushing it also can make a
radical difference.

I find filling the cab with my heater on mix makes it the warmest. I
run about 1/3 to the glass and 2/3 to the floor. My CJ7 is already
almost too hot on the driver's feet, hot enough to make them sweat at
-25F which isn't always a good thing. Gotta have spare socks and boots
to change into if going out into it after driving any distance. I
almost got frostbite while setting up a camp at -25 last winter because
my feet were wet and I forgot to change.

If I heat it up before I hit the highway for a trip or something like
that, I have the best heat. It has a hard time heating up a cold cab at
65 mph in -20 or -30 or so.

Others have mentioned using a wind jammer that isolates the front from
the back. When we go on trips, we always load behind the front seat to
the roof first, then fill back after for this reason. It does heat up a
lot faster with the back blocked off. The fold and tilt back seat
blocks half of it if I leave it in.

Just for the heck of it, you might want to run a booster cable from the
battery negative to the heater motor's case to see if it speeds up. The
one on our Cherokee radically sped up so I added a second body ground
cable.

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!
Aug./05 http://www.imagestation.com/album/in...?id=2120343242
(More Off Road album links at bottom of the view page)


paul wrote:
>
> Would there be any negative implications to 'capping' the passenger side
> heat duct?
> 90% of the time I drive alone and it has gotten to that time of year when
> getting a little extra heat helps.
> Does a higher temp thermostat make a 'big' difference? I currently have a
> 185.
>
> tia
> paul

Re: YJ heater question prt. II
 

The hotter t-stat does make a difference. Flushing it also can make a
radical difference.

I find filling the cab with my heater on mix makes it the warmest. I
run about 1/3 to the glass and 2/3 to the floor. My CJ7 is already
almost too hot on the driver's feet, hot enough to make them sweat at
-25F which isn't always a good thing. Gotta have spare socks and boots
to change into if going out into it after driving any distance. I
almost got frostbite while setting up a camp at -25 last winter because
my feet were wet and I forgot to change.

If I heat it up before I hit the highway for a trip or something like
that, I have the best heat. It has a hard time heating up a cold cab at
65 mph in -20 or -30 or so.

Others have mentioned using a wind jammer that isolates the front from
the back. When we go on trips, we always load behind the front seat to
the roof first, then fill back after for this reason. It does heat up a
lot faster with the back blocked off. The fold and tilt back seat
blocks half of it if I leave it in.

Just for the heck of it, you might want to run a booster cable from the
battery negative to the heater motor's case to see if it speeds up. The
one on our Cherokee radically sped up so I added a second body ground
cable.

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!
Aug./05 http://www.imagestation.com/album/in...?id=2120343242
(More Off Road album links at bottom of the view page)


paul wrote:
>
> Would there be any negative implications to 'capping' the passenger side
> heat duct?
> 90% of the time I drive alone and it has gotten to that time of year when
> getting a little extra heat helps.
> Does a higher temp thermostat make a 'big' difference? I currently have a
> 185.
>
> tia
> paul

Re: YJ heater question prt. II
 

The hotter t-stat does make a difference. Flushing it also can make a
radical difference.

I find filling the cab with my heater on mix makes it the warmest. I
run about 1/3 to the glass and 2/3 to the floor. My CJ7 is already
almost too hot on the driver's feet, hot enough to make them sweat at
-25F which isn't always a good thing. Gotta have spare socks and boots
to change into if going out into it after driving any distance. I
almost got frostbite while setting up a camp at -25 last winter because
my feet were wet and I forgot to change.

If I heat it up before I hit the highway for a trip or something like
that, I have the best heat. It has a hard time heating up a cold cab at
65 mph in -20 or -30 or so.

Others have mentioned using a wind jammer that isolates the front from
the back. When we go on trips, we always load behind the front seat to
the roof first, then fill back after for this reason. It does heat up a
lot faster with the back blocked off. The fold and tilt back seat
blocks half of it if I leave it in.

Just for the heck of it, you might want to run a booster cable from the
battery negative to the heater motor's case to see if it speeds up. The
one on our Cherokee radically sped up so I added a second body ground
cable.

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!
Aug./05 http://www.imagestation.com/album/in...?id=2120343242
(More Off Road album links at bottom of the view page)


paul wrote:
>
> Would there be any negative implications to 'capping' the passenger side
> heat duct?
> 90% of the time I drive alone and it has gotten to that time of year when
> getting a little extra heat helps.
> Does a higher temp thermostat make a 'big' difference? I currently have a
> 185.
>
> tia
> paul