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My temp is erratic and less than usual

A 195 degree F thermostat was installed last year and the temp ran at about 80 C. Now it is 20 Degrees C cooler and the electric fan seems erratic. is it my temp sender or my thermostat?? Maybe I should replace both?? A parts house shows a housing containing a thermostat but my thermostat was all that was changed. Likely late 2006 was different and was in a housing complete. I think I recall the thermostat purchase last year caused this same confusion.

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You should have the vehicle-- what ever it is,
tested to find a problem

You replace NO PARTS until you find a problem
that require parts

Posted on Nov 14, 2014

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What is the average temp for a 1996 Pontiac Gran Am 2.4 L 4 cyl? Any info would greatly be appreciated.


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Which thermostat do I purchase for my 1994 Dodge Stealth (automatic SOHC)? Choices are Beck/Arnley 170 Degrees F, Stant 170 Degrees F, Stant 180 Degrees F, Stant 195 Degrees F.


either of these manufactures are good just install one with the manufactures recommended temperature rating,as the wrong temp range can change how the car will run.example gas mileage,running temperature,cooling fan operation etc.

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220 degrees is normal operaing temperature for your car. The thermostat does not open until 195 degrees and the fans don't come on until 126 to 128 degrees. If it gets over 129 degrees and the fans have not turned on then the cooling fan system is the cause of the problem. (cooling fan, cooling fan temp switch, cooling fan relay, etc.)

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Temp runs only 180 degrees. High temp thermostat


yes thermostats wear out. make sure your cooling fans are not running at the low temp you have. you may have a bad temp sending unit. also you gauge send ing unit could be bad.

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What the normal temperature operating range indicated on the temp gauge?


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Did you bleed the air out after installing the thermostat? Trapped air will not allow the coolant to do it's job.

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1 Answer

I went for an emissions test today and it failed the mechanic said the car might be running too hot or too lean also notice the the heat gauge stays at cold when driving.HELP


I suspect you need a new thermostat. It should be running at 195 degrees F.

If the engine does not fully warm up, the engine can not go into emission control mode.

The engine temperature sensor sends a signal to the engine/emissions computer that the engine is now at normal operating temp. The computer then starts controlling fuel flow, EGR, etc. so that emissions are being controlled.

When the enigne is cold, you are in what we call "open loop" meaning no emission control.

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Then you should pass.

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