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Cooling problem with Jeep Cherokee



 
 
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Old January 25th 05, 06:57 PM
Mike Romain
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TCS wrote:
>
> On Tue, 25 Jan 2005 11:56:02 -0500, Ed > wrote:
> >On Tue, 25 Jan 2005 11:04:08 -0500 Mike Romain > wrote:

>
> >>Jeeps have really crappie sensors, especially the temperature one. I
> >>would check the connections on it first, then replace it before doing
> >>any rad work. If it 'really' was in the red, you would feel it....
> >>
> >>The sensor is on the top of the head on the back drivers side corner and
> >>has a purple wire going to it.

>
> >I had considered a sensor problem (maybe an intermittent thing or short in the
> >harness?), but, why would the radiator hoses and radiator be barely warm (almost
> >cold), to the touch?

>
> no coolant flow


My Jeep hoses stay cool, well almost cold this time of year and my CJ7
recently started 'overheating' big time on me. 3 times I have pulled
over expecting an explosion only to still have cold hoses and no
pressure build up. Checked the fluid and it's perfect.

I have had a t-stat stick shut and there is no mistaking it. The bottom
rad hose is cold and both hoses are swelled hard with pressure from the
boiling liquid in the head with steam coming out the cap.

The engine was also smoking hot.

He can open the rad cap when the engine is cold and off and start and
warm it up with it open watching to see what happens. If the t-stat is
stuck, he won't get flow until enough pressure builds up and then an
explosion of fluid will be observed with piles of super hot steam.

If everything is right, he will just observe a flow of fluid once the
t-stat opens.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
 




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