Question about 2001 GMC Jimmy

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Thermostats & A/C

One main question... Can a bad thermostat make your A/C not work? I changed my stuck open thermostat on my '01 Jimmy and my A/C automatically starts working again. Please explain why this happens. Thanks!

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  • Eric
    Eric Jan 31, 2009

    for 2-3 weeks the a/c compressor clutch would spin for a few seconds then stop... no cold air, so I thought, OK no more cold air in the summer! But yesterday after I replaced my thermostat it(a/c & clutch) starts working fine.

  • yadayada
    yadayada May 11, 2010

    why don't u give all the info the 1st time, your AC is low on charge.

  • Roberta Smith
    Roberta Smith May 11, 2010

    chances are you removed a wire or harness and plugged it back in or something similiar .... so it's good

  • yadayada
    yadayada May 11, 2010

    a stuck/defective engine thermostat will not affect the AC

  • Roberta Smith
    Roberta Smith May 11, 2010

    you were lucky



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When it stops wirking agian tap on the clutch and see if it engages may have a bad magnetic cluthc coil

Posted on Apr 15, 2009


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What do you mean by bad ? Thermostats can be stuck open or closed . Stuck closed , the engine will over heat . Stuck open the engine will not get up to operating temp . , your year vehicle , would cause a code to set . Wouldn't cause a transmission shift problem . Have the vehicle checked for DTC'S - diagnostic trouble codes . Now a faulty ECT - engine coolant temp. sensor could cause shifting .

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When thermostat bad

What do you mean by your thermostat is bad? Does it refuse to open causing your vehicle to overheat? Is it sticking open causing your vehicle to not reach operating temp? In some case buying cheap thermostats have been known to fail frequently, i've changed the thermostat on vehicles before using cheap parts and had two brand new ones in a row fail. You can test a thermostat by heating water on the stove and testing the temperature with a meat thermometer, the thermostat should retract its spring around the posted temperature that its made for. In most cases its written somewhere on the thermostat itself. If you can describe what problem you're having with the vehicle itself in more detail it will be easier to diagnose your problem.

Feb 27, 2014 | Pontiac Sunfire Cars & Trucks

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Open stuck thermostat

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Nov 25, 2013 | Cars & Trucks

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The heat don't work in my 91 plymouth acclaim

I could be that there is no antifreeze in the radiator, that the thermostat is bad, or that the heater core is bad. try checking the antifreeze first. sometimes the thermostats in those cars get stuck open due to corrosion on the thermostat housing.

Feb 13, 2013 | Plymouth Acclaim Cars & Trucks

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Unless you are in the Artic, there is little need to change thermostats. Once Pollution controls were invented the operating temperature of engines were raised to about 195 degrees on average.

In the old days, thermostats were as low as 165 degrees and I believe as high as 210 degrees.

In the old days, you did not have Automatic Electric radiator cooling fans to supplement the water system. If you were to increase todays thermostats by too high of a margin, the Electric cooling fans would run almostt constantly.

Please rate my info.

Nov 14, 2012 | 2001 GMC Jimmy

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Just flushed rad heater core and block because i had no heat. flushed the system filled with new antifreeze. my temp gauge will change from 150 to 210 I have heat then i dont

Replace the thermostat. I have had bad luck with aftermarket thermostats on this particular year of GM/ Chevy trucks.They tend to stick closed and then fully open, thus causing the temp to sort of surge hot and cold. A good thermostat will slowly open maintaning a good consistant temp. I would recommend spending a little more and getting a GM thermostat.

Please take a moment and rate my answer..........Thanks

Dec 01, 2010 | 1996 GMC Jimmy

1 Answer

Car seems to be heating up dont know if it can be a stuck or bad thermostat

thats a good possibility, though most thermostats get stuck open, not closed. check the coolant level to make sure its ok, a lot of times the water pump will go bad, and allow air to seep in causing air pockets, thus making the vehicle overheat, also is it blowing good heat?? might be heater core leaking.

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Can a thremastat stuck open have low engine temp and bad gas milage

If the thermostat is stuck open it would eventually get hot after a while. It's like some people think you can remove the thermostat to keep the engine from getting hot so in theory it could for a little while, however it would eventually overheat. As for the gas mileage being bad yes if it was stuck open and was not warming up fast enough the computer would take longer to go into closed loop, meaning the engine temperature takes to long to heat up so it burns rich until it does warm up enough, however it would be a minor change of mileage say 2 to 3 miles to the gallon. Hope this helps.

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A bad water pump will normally overheat at lower speeds. If you notice the engine temp comes down when you turn on the heater, it's most likely the water pump.
Best of luck.

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