Cooling fans
80

Asked by GuruD4WC2 Aug 02, 2017 at 05:22 PM about the 2001 Pontiac Montana

Question type: Maintenance & Repair

Cooling fans not running how can I trouble
shoot it

4 Answers
35,335

lrodri911 answered 7 years ago

Turn on the a/c if fans turn on, check the cooling temperature sensor. If they don't, check fuses and fan connector plug

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Jharper4u2c answered 4 years ago

This isn't an answer I'm having the same problem also.did anybody give u guys an answer to the problem wen unplugged fans work but when plugged into temp sender dont work with air on dont work...?????

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Guru9463ND answered 4 years ago

Two circuits. One circuit is low speed and is for when a/c is on. Second one is for high speed and is controlled by the temp sensor. Consider sensor unplugged and fans work but not if plugged in. This indicates the sensor is bad. Now consider a/c is on and fans do not work. There is a separate fuse and relay that controls this. I would check the 30 amp fuse and the relay. Since there are two 30 amp fuses and two cooling fan relays are the same. I would swap the 30 amp relays and see if the a/c on makes the fans come on. Probably can look at the fuse and see if it is blown. I would switch the two same numbered cooling fan relays to see if the a/c makes the fans come on.

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