Question about 2000 Pontiac Grand Prix

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Cooling fan not working

Cooling fan not running when engine gets to temp. but both fans will turn on immediately if air conditioner is turned on. already changed engine temp sensor, primary cooling fan relay, all fuses are functional.

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  • wilbert muswere Aug 16, 2013

    cooling fans can only respond to temperature changes being the manipulation caused by the two pin fan temp sensor. what if u pullout the socket and the fans start condinuosly and when connected the fans remain silent even after the vehicle remin iddling for 30mins?

  • Anonymous Mar 12, 2014

    Fan is stll running after engine is turned off, will not turn off what should I do?

  • Anonymous Mar 19, 2014

    Fans only run when temp sensor is unplugged on 01. V.

  • Anonymous Mar 20, 2014

    engine light comes on when car is cranking up,the fans are not turning,but turn hen the air conditioner is on is this a relay problem,do i need to have the fuse changed out on the relay box.

  • Anonymous Mar 22, 2014

    ive changed fan two relays checked fuses

  • Anonymous Mar 24, 2014

    where the tem senor location to make cooling fans run right i know one fan come on before the oyher one

  • Anonymous Mar 28, 2014

    cooling fan only works when air conditioner or heater is running

  • Anonymous Mar 29, 2014

    cooling fan is not turn on
    cooling sensor i replaced ,relay and fan is working

  • Anonymous Mar 29, 2014

    how hot does the engine have to be before the cooling fan turns on, I got it to about 200 degrees and it did not turn on, could it be bad

  • Anonymous Mar 30, 2014

    Fans only operate when air conditioner is on

  • Anonymous Mar 30, 2014

    electric cooling fans do not operate no fuses blown fans work if direct wired where is sensor for fans located?

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  • Pontiac Master
  • 70,346 Answers

The fans only run when the engine reaches approxminatly 235 degrees F. on the guage that is near the end of scale just before guage show "HOT" I don't think you have a problem, allot of folks out there don't know about this.

Posted on Aug 22, 2008

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The 2nd fan is for your Air-Conditioner that should run when the cabin temp is set low enough for the Air-Conditioner compressor to run. This fan should run anytime the Air-Conditoner is switched on.
If your experiencing engine over heat problems when driving slow or sitting idle most likely the fan switch that is switched on by water temperature has failed. The fan switch controls a fan relay and if the relay fails the fan will not run. In this particular model there is a cooling fan module that controls the fan.

Read this link but DO NOT click on any links from that webpage: (They do not work)
http://www.fixautopartz.com/2009/03/20/2003-mitsubishi-outlander-engine-cooling-system

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