Question about 1992 Pontiac Grand Prix

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Cooling Fans Wont Kick In

My cooling fans wont turn on on my 92 grand prix. it is the 3.4 manual. changed the relays and that didnt work. any other suggestions?

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  • Orlando Delacruz Aug 09, 2013

    yes try your temperature switch. but first make sure to try and power up the fan with hot wire to them from battery to fan if it works then most likely it is temperature sending unit

  • Orlando Delacruz Aug 09, 2013

    also try this very first thing turn air on to max , it will take a bit but then let it warm up if the fans turn, on and they will if every else is good but the temperature sending unit, then replace it only the fans should turn on about when the pointer reaches a bit past the half way mark

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Make sure the fans are not locked up. They are after all just electric motors. If they spin freely by hand, that's a good start.

Otherwise, there will be two wires coming off the fan. Trace these wires and unplug them.

Taking these two wires, take a car or lawn mower battery (12V) and touch one of the wires to positive, and one to negative. It doesn't matter which. If the fan comes on, then the fan is good. If you reverse polarity then the fan only spins backwards.

If it doesn't come on, then it's a bad fan.

If it does, then it probably your temp sensor. The fans should come on automatically when you cut on your air conditioning.

Posted on Feb 10, 2009

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Temp sending unit has gone out it tells the fans through the relays to come on. Those units are usually found on th block where the radiator hose couples to the motor.

Posted on Feb 10, 2009

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I would start by checking power supply to the cooling fans,making sure the coolant system is full,& using a scn tool to verify the proper operation of the cooling fan system.Here is some info to help you.

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When certain Diagnostic Trouble Codes (DTCs) are present, the PCM may command the cooling fans to run all the time. It is important to perform the Powertrain On-Board Diagnostic System check prior to diagnosing the engine cooling fans.The PCM will complete the ground path for cooling fan relay #1 under any of the following conditions:
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Hope this help to solve your poblem (remember rated and comment this help).

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12_4_2011_10_30_47_pm.jpg

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