temp. guage going crazy???

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robert -wanda fox - 29 May 2006 21:32 GMT

hi,does anybody have any ideas on this one,,92 cougar(3.8),the temp guage
goes back and forth continously throughout the car running,but the car is
not overheating,the car also tends to run rough untill warmed up and even
though car stops stalling and rough ideling after around 5 or so minutes of
being warmed up the temp. guage continues to fluxuate wildly,i am guessing a
bad temp. sensor that might also have something to do with messing up the
cp readings causing the rough idle(iac has been checked and cleaned).any
suggestions??? thanks

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Paul of Dayon - 29 May 2006 22:25 GMT

First guess (if you have enough coolant) is the engine thermostat. You
might also want to see if bubbles are coming out the overflow when the
engine is running. When the head gasket failed in my '93 Cougar, there was
enough gas (air) in the system to keep the coolant away from the sensor so
it showed cool all the time. No heat from heater, either. It ran fine cold
but ran very bad warmed up. Of course, the two symptoms might not be
related at all.

If the gauge goes nuts right after a cold start it's likely a wiring
problem.

PoD

> hi,does anybody have any ideas on this one,,92 cougar(3.8),the temp guage
> goes back and forth continously throughout the car running,but the car is
[quoted text clipped - 6 lines]
> cp readings causing the rough idle(iac has been checked and cleaned).any
> suggestions??? thanks

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Steve Stone - 30 May 2006 00:59 GMT

Any other gauges going nuts in harmony with the temp ? Then is could be the
cluster voltage regulator

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