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Old October 3rd 08, 09:37 PM posted to rec.autos.4x4
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Default 99 Jeep Wrangler 4.0 weird overheating problem

On Aug 25, 10:46*am, wrote:
> I love my Jeep. *I've had it since I drove it off the lot new. *That
> was 140k miles ago, and it still looks and runs nearly the same as my
> first trip...Except
>
> The last few months it has been running hot once in awhile. *It is
> generally on very hot and humid days, but in the past it handled them
> fine.
>
> I suspected the thermostat, so I replaced it and the housing, power
> flushed the cooling system (it needed it). *It seemed to do the trick,
> but then again it cooled off outside so probably was a coincidence.
> It happened again.
>
> I checked the fan clutch and it seems fine, I cleared out the radiator
> fins, checked tightness of the S-belt. *All good. *I am thinking maybe
> it is the sending unit, because the way it overheats is very odd.
>
> It will go up to 210 and just sit there like it is supposed to. *When
> it overheats, it doesn't just gradually increase, it snaps up to just
> under the red line and the "Check Gauges" light comes on. *Then a
> couple minutes later it will snap back down to 210. *Then a bit later
> it will snap back up again to under the red and then snap back down.
>
> No noises or noticable changes in performance. *I was wondering if
> this is some kind of computer symptom of something else overheating,
> but I can't find anything on it anywhere.
>
> Any ideas?


did u ever find out what was wrong with your jeep? I have a similar
Problem with my 2000 jeep.. Please let me
Know ....
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