90 Cherokee 4.0L back on road after winter, it now overheats. I changed
the thermostat and refilled. Still overheats. I thought that maybe it
could be an air lock or something, but after playing with the system I can't
seem to get it any better. I tried burping the system by cracking the hoses
open one at a time and allowing some air out but it did not seem to help.
It does not seem like there is any flow in the upper hose at all, but there
is coolant in it. Any other check for a waterpump before I throw parts at
it. There is no leaking fluid anywhere in the system, the shaft on the pump
also feels fine. Any help would be appreciated. Dave.

 

Sounds like a bad thermostat or thermostat in backwards.

dcollivier wrote:
> 90 Cherokee 4.0L back on road after winter, it now overheats. I changed
> the thermostat and refilled. Still overheats. I thought that maybe it
> could be an air lock or something, but after playing with the system I can't
> seem to get it any better. I tried burping the system by cracking the hoses
> open one at a time and allowing some air out but it did not seem to help.
> It does not seem like there is any flow in the upper hose at all, but there
> is coolant in it. Any other check for a waterpump before I throw parts at
> it. There is no leaking fluid anywhere in the system, the shaft on the pump
> also feels fine. Any help would be appreciated. Dave.
>
>

 

Sounds like a bad thermostat or thermostat in backwards.

dcollivier wrote:
> 90 Cherokee 4.0L back on road after winter, it now overheats. I changed
> the thermostat and refilled. Still overheats. I thought that maybe it
> could be an air lock or something, but after playing with the system I can't
> seem to get it any better. I tried burping the system by cracking the hoses
> open one at a time and allowing some air out but it did not seem to help.
> It does not seem like there is any flow in the upper hose at all, but there
> is coolant in it. Any other check for a waterpump before I throw parts at
> it. There is no leaking fluid anywhere in the system, the shaft on the pump
> also feels fine. Any help would be appreciated. Dave.
>
>

 

Sounds like a bad thermostat or thermostat in backwards.

dcollivier wrote:
> 90 Cherokee 4.0L back on road after winter, it now overheats. I changed
> the thermostat and refilled. Still overheats. I thought that maybe it
> could be an air lock or something, but after playing with the system I can't
> seem to get it any better. I tried burping the system by cracking the hoses
> open one at a time and allowing some air out but it did not seem to help.
> It does not seem like there is any flow in the upper hose at all, but there
> is coolant in it. Any other check for a waterpump before I throw parts at
> it. There is no leaking fluid anywhere in the system, the shaft on the pump
> also feels fine. Any help would be appreciated. Dave.
>
>

 

Sounds like a bad thermostat or thermostat in backwards.

dcollivier wrote:
> 90 Cherokee 4.0L back on road after winter, it now overheats. I changed
> the thermostat and refilled. Still overheats. I thought that maybe it
> could be an air lock or something, but after playing with the system I can't
> seem to get it any better. I tried burping the system by cracking the hoses
> open one at a time and allowing some air out but it did not seem to help.
> It does not seem like there is any flow in the upper hose at all, but there
> is coolant in it. Any other check for a waterpump before I throw parts at
> it. There is no leaking fluid anywhere in the system, the shaft on the pump
> also feels fine. Any help would be appreciated. Dave.
>
>

 

I also had a overheating problem with my 90 XJ. I did a bit of research
and found this swap. Pretty easy and cost less than 150.00 ........No
more problems.

http://www.off-road.com/jeep/cheroke.../radiator.html

 

I also had a overheating problem with my 90 XJ. I did a bit of research
and found this swap. Pretty easy and cost less than 150.00 ........No
more problems.

http://www.off-road.com/jeep/cheroke.../radiator.html

 

I also had a overheating problem with my 90 XJ. I did a bit of research
and found this swap. Pretty easy and cost less than 150.00 ........No
more problems.

http://www.off-road.com/jeep/cheroke.../radiator.html

 

I also had a overheating problem with my 90 XJ. I did a bit of research
and found this swap. Pretty easy and cost less than 150.00 ........No
more problems.

http://www.off-road.com/jeep/cheroke.../radiator.html

 

On Tue, 3 May 2005 21:44:50 -0400, "dcollivier"
<dc.ollivier@sympatico.ca> wrote:

>90 Cherokee 4.0L back on road after winter, it now overheats. I changed
>the thermostat and refilled. Still overheats. I thought that maybe it
>could be an air lock or something, but after playing with the system I can't
>seem to get it any better. I tried burping the system by cracking the hoses
>open one at a time and allowing some air out but it did not seem to help.
>It does not seem like there is any flow in the upper hose at all, but there
>is coolant in it. Any other check for a waterpump before I throw parts at
>it. There is no leaking fluid anywhere in the system, the shaft on the pump
>also feels fine. Any help would be appreciated. Dave.

Do you have a 2'nd electric fan? Is it kicking on at all?
also did you check for actual flow of fluid? I have seen an old water
pump that looked fine from the outside but the vanes were pretty much
corroded right down to stumps and it really wasn't moving any water.


Drifter
"I've been here, I've been there..."