Hi I have an 89 YJ that is pumping cold air but the temp gauge is
reading 210 degs. I just change the thermostat hoping to fix the
problem but still having the same issue.

I think that there is either a clog or air lock but I'm not sure how
to test it or fix. I was thinking of flushing the system but have
never done that on this vehicle before. I've run the car with the
radiator cap off and did not see any circulation of fluids. I also
noticed that the hoses going and coming out of the firewall are cool.

Any help is appreciated.

 

"lee" <mrlee727@hotmail.com> wrote in message
news:21fdf96c.0310210841.43e9c04b@posting.google.c om...
> Hi I have an 89 YJ that is pumping cold air but the temp gauge is
> reading 210 degs. I just change the thermostat hoping to fix the
> problem but still having the same issue.
>
> I think that there is either a clog or air lock but I'm not sure how
> to test it or fix. I was thinking of flushing the system but have
> never done that on this vehicle before. I've run the car with the
> radiator cap off and did not see any circulation of fluids. I also
> noticed that the hoses going and coming out of the firewall are cool.
>
> Any help is appreciated.

It sounds like the heater core is plugged up. This it quite common on all
vehicles. The passages in the heater core are smaller than a radiator's. You
can test this by running one of the hater core hoses to the other connection
on the engine. If the hose gets hot, then you know the restriction is in the
core. If you do need a core, I would take the Jeep to a reputable shop that
knows how to correctly flush a cooling system and have it flushed when you
put the heater core in. For the future, I recommend using distilled water in
your cooling system whenever possible (with antifreeze of course). This will
cut down on the calcification that causes the heater core to plug up. My
friend has a radiator repair shop and charges about $45 to flush a system
and put in fresh antifreeze, so it shouldn't be too expensive to have it
done where you live.

Chris

 

"lee" <mrlee727@hotmail.com> wrote in message
news:21fdf96c.0310210841.43e9c04b@posting.google.c om...
> Hi I have an 89 YJ that is pumping cold air but the temp gauge is
> reading 210 degs. I just change the thermostat hoping to fix the
> problem but still having the same issue.
>
> I think that there is either a clog or air lock but I'm not sure how
> to test it or fix. I was thinking of flushing the system but have
> never done that on this vehicle before. I've run the car with the
> radiator cap off and did not see any circulation of fluids. I also
> noticed that the hoses going and coming out of the firewall are cool.
>
> Any help is appreciated.

It sounds like the heater core is plugged up. This it quite common on all
vehicles. The passages in the heater core are smaller than a radiator's. You
can test this by running one of the hater core hoses to the other connection
on the engine. If the hose gets hot, then you know the restriction is in the
core. If you do need a core, I would take the Jeep to a reputable shop that
knows how to correctly flush a cooling system and have it flushed when you
put the heater core in. For the future, I recommend using distilled water in
your cooling system whenever possible (with antifreeze of course). This will
cut down on the calcification that causes the heater core to plug up. My
friend has a radiator repair shop and charges about $45 to flush a system
and put in fresh antifreeze, so it shouldn't be too expensive to have it
done where you live.

Chris

 

"lee" <mrlee727@hotmail.com> wrote in message
news:21fdf96c.0310210841.43e9c04b@posting.google.c om...
> Hi I have an 89 YJ that is pumping cold air but the temp gauge is
> reading 210 degs. I just change the thermostat hoping to fix the
> problem but still having the same issue.
>
> I think that there is either a clog or air lock but I'm not sure how
> to test it or fix. I was thinking of flushing the system but have
> never done that on this vehicle before. I've run the car with the
> radiator cap off and did not see any circulation of fluids. I also
> noticed that the hoses going and coming out of the firewall are cool.
>
> Any help is appreciated.

It sounds like the heater core is plugged up. This it quite common on all
vehicles. The passages in the heater core are smaller than a radiator's. You
can test this by running one of the hater core hoses to the other connection
on the engine. If the hose gets hot, then you know the restriction is in the
core. If you do need a core, I would take the Jeep to a reputable shop that
knows how to correctly flush a cooling system and have it flushed when you
put the heater core in. For the future, I recommend using distilled water in
your cooling system whenever possible (with antifreeze of course). This will
cut down on the calcification that causes the heater core to plug up. My
friend has a radiator repair shop and charges about $45 to flush a system
and put in fresh antifreeze, so it shouldn't be too expensive to have it
done where you live.

Chris

 

> I just change the thermostat hoping to fix the
> problem but still having the same issue.

Yep, the thermostat would control how hot your heater might get, but would
not keep it from producing some kind of heat.

> I think that there is either a clog or air lock

Yep, could even be a bad heater core.

> I was thinking of flushing the system but have
> never done that on this vehicle before.

No time to learn like the present. Your local auto store sells flush kits
with directions.

> I've run the car with the
> radiator cap off and did not see any circulation of fluids.

You have to wait till the thermostat opens (210 deg) before you see
circulation.

> I also noticed that the hoses going and coming out of the firewall are
cool.

You will know it's fixed when both hoses are hot

--
JimG
80' CJ-7, 258 CID
35" BFG MT's on 15x10 Centerlines
4.56 D30-D44 SOA
D300 w/4:1 & Currie twin sticks
Warn 8000i w/dual batteries
LockRight F&R


"lee" <mrlee727@hotmail.com> wrote in message
news:21fdf96c.0310210841.43e9c04b@posting.google.c om...
> Hi I have an 89 YJ that is pumping cold air but the temp gauge is
> reading 210 degs. I just change the thermostat hoping to fix the
> problem but still having the same issue.
>
> I think that there is either a clog or air lock but I'm not sure how
> to test it or fix. I was thinking of flushing the system but have
> never done that on this vehicle before. I've run the car with the
> radiator cap off and did not see any circulation of fluids. I also
> noticed that the hoses going and coming out of the firewall are cool.
>
> Any help is appreciated.

 

> I just change the thermostat hoping to fix the
> problem but still having the same issue.

Yep, the thermostat would control how hot your heater might get, but would
not keep it from producing some kind of heat.

> I think that there is either a clog or air lock

Yep, could even be a bad heater core.

> I was thinking of flushing the system but have
> never done that on this vehicle before.

No time to learn like the present. Your local auto store sells flush kits
with directions.

> I've run the car with the
> radiator cap off and did not see any circulation of fluids.

You have to wait till the thermostat opens (210 deg) before you see
circulation.

> I also noticed that the hoses going and coming out of the firewall are
cool.

You will know it's fixed when both hoses are hot

--
JimG
80' CJ-7, 258 CID
35" BFG MT's on 15x10 Centerlines
4.56 D30-D44 SOA
D300 w/4:1 & Currie twin sticks
Warn 8000i w/dual batteries
LockRight F&R


"lee" <mrlee727@hotmail.com> wrote in message
news:21fdf96c.0310210841.43e9c04b@posting.google.c om...
> Hi I have an 89 YJ that is pumping cold air but the temp gauge is
> reading 210 degs. I just change the thermostat hoping to fix the
> problem but still having the same issue.
>
> I think that there is either a clog or air lock but I'm not sure how
> to test it or fix. I was thinking of flushing the system but have
> never done that on this vehicle before. I've run the car with the
> radiator cap off and did not see any circulation of fluids. I also
> noticed that the hoses going and coming out of the firewall are cool.
>
> Any help is appreciated.

 

> I just change the thermostat hoping to fix the
> problem but still having the same issue.

Yep, the thermostat would control how hot your heater might get, but would
not keep it from producing some kind of heat.

> I think that there is either a clog or air lock

Yep, could even be a bad heater core.

> I was thinking of flushing the system but have
> never done that on this vehicle before.

No time to learn like the present. Your local auto store sells flush kits
with directions.

> I've run the car with the
> radiator cap off and did not see any circulation of fluids.

You have to wait till the thermostat opens (210 deg) before you see
circulation.

> I also noticed that the hoses going and coming out of the firewall are
cool.

You will know it's fixed when both hoses are hot

--
JimG
80' CJ-7, 258 CID
35" BFG MT's on 15x10 Centerlines
4.56 D30-D44 SOA
D300 w/4:1 & Currie twin sticks
Warn 8000i w/dual batteries
LockRight F&R


"lee" <mrlee727@hotmail.com> wrote in message
news:21fdf96c.0310210841.43e9c04b@posting.google.c om...
> Hi I have an 89 YJ that is pumping cold air but the temp gauge is
> reading 210 degs. I just change the thermostat hoping to fix the
> problem but still having the same issue.
>
> I think that there is either a clog or air lock but I'm not sure how
> to test it or fix. I was thinking of flushing the system but have
> never done that on this vehicle before. I've run the car with the
> radiator cap off and did not see any circulation of fluids. I also
> noticed that the hoses going and coming out of the firewall are cool.
>
> Any help is appreciated.

 

I am having the SAME problem on my CJ-7. Do you guys know if I have to take
the dash completely off to access the heater core?

Thanks

--
- Pablo

1981 CJ-7 Laredo 360 V8
2000 WJ Laredo V8 QuadraDrive
2003 TJ Rubicon

"lee" <mrlee727@hotmail.com> wrote in message
news:21fdf96c.0310210841.43e9c04b@posting.google.c om...
> Hi I have an 89 YJ that is pumping cold air but the temp gauge is
> reading 210 degs. I just change the thermostat hoping to fix the
> problem but still having the same issue.
>
> I think that there is either a clog or air lock but I'm not sure how
> to test it or fix. I was thinking of flushing the system but have
> never done that on this vehicle before. I've run the car with the
> radiator cap off and did not see any circulation of fluids. I also
> noticed that the hoses going and coming out of the firewall are cool.
>
> Any help is appreciated.

 

I am having the SAME problem on my CJ-7. Do you guys know if I have to take
the dash completely off to access the heater core?

Thanks

--
- Pablo

1981 CJ-7 Laredo 360 V8
2000 WJ Laredo V8 QuadraDrive
2003 TJ Rubicon

"lee" <mrlee727@hotmail.com> wrote in message
news:21fdf96c.0310210841.43e9c04b@posting.google.c om...
> Hi I have an 89 YJ that is pumping cold air but the temp gauge is
> reading 210 degs. I just change the thermostat hoping to fix the
> problem but still having the same issue.
>
> I think that there is either a clog or air lock but I'm not sure how
> to test it or fix. I was thinking of flushing the system but have
> never done that on this vehicle before. I've run the car with the
> radiator cap off and did not see any circulation of fluids. I also
> noticed that the hoses going and coming out of the firewall are cool.
>
> Any help is appreciated.

 

I am having the SAME problem on my CJ-7. Do you guys know if I have to take
the dash completely off to access the heater core?

Thanks

--
- Pablo

1981 CJ-7 Laredo 360 V8
2000 WJ Laredo V8 QuadraDrive
2003 TJ Rubicon

"lee" <mrlee727@hotmail.com> wrote in message
news:21fdf96c.0310210841.43e9c04b@posting.google.c om...
> Hi I have an 89 YJ that is pumping cold air but the temp gauge is
> reading 210 degs. I just change the thermostat hoping to fix the
> problem but still having the same issue.
>
> I think that there is either a clog or air lock but I'm not sure how
> to test it or fix. I was thinking of flushing the system but have
> never done that on this vehicle before. I've run the car with the
> radiator cap off and did not see any circulation of fluids. I also
> noticed that the hoses going and coming out of the firewall are cool.
>
> Any help is appreciated.