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Old January 25th 05, 07:31 PM
TCS
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On Tue, 25 Jan 2005 12:57:31 -0500, Mike Romain > wrote:
>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.

indicative of no coolent flow



>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.


Sounding more like a bad pump. They're rock simple; pull it out,
and see if the shaft to the pump blades is broken. Obviously, the
fan belt should have already been checked.
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