COOLING FANS

  • Tiny
  • michael1984
  • 2000 Pontiac Grand Am
  • 6 CYL
  • 2WD
  • automatic
  • 109,000 miles

My cooling fan only comes on when I turn on the A/C.I changed the temp sensor I checked the fuses and relays. But they don't come on like the should when the A/C off. Would could be the problem. The car is a 2000 pontiac grand am GT.

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Thursday, June 9th, 2011 AT 8:32 PM

9 Replies

  • Tiny
  • Docfixit
  • Expert
  • 18,993 posts

Try swaping fanrelay 1 with 2 if it works off temp then relay if not wiring or PCM. Do both fans come on with AC? Checked fan motor?

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Thursday, June 9th, 2011 AT 8:46 PM
  • Tiny
  • michael1984
  • Member

I checked the fan motors they are good. And both fans does come on when A/C is on. WHAT IS A PCM?

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Thursday, June 9th, 2011 AT 9:01 PM
  • Tiny
  • Docfixit
  • Expert
  • 18,993 posts

Cars computer

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Thursday, June 9th, 2011 AT 9:05 PM
  • Tiny
  • michael1984
  • Member

Ok thankyou for ur help

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Thursday, June 9th, 2011 AT 9:07 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,258 posts

I see this question time and time again and 95% of the time, there is nothing at all wrong. These fans aren't programmed to come on until very high temps. It is a 2 speed system and low speed doesn't come on until about 225 degrees. That may seem to hot but it is not and this is the way it was designed to run.

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Thursday, June 9th, 2011 AT 10:00 PM
  • Tiny
  • michael1984
  • Member

Will the pcm give a code if its a problem with the computer. Because the car is running fine except the fans not coming on? Will it show other sign that the pcm is not working proberly.

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Thursday, June 9th, 2011 AT 11:41 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,258 posts

There is nothing wrong with your computer. You have proven that the computer has control of the fans because they come on with the A/C. I doubt there is anything wrong.

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Thursday, June 9th, 2011 AT 11:45 PM
  • Tiny
  • michael1984
  • Member

Cause even when the niddle temp gauge gets to the middle and the niddle goes past the half point the fans still don't come on. Don't the niddle guage should stay in the middle?

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Thursday, June 9th, 2011 AT 11:51 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,258 posts

No, it shouldn't, as I have already pointed out.

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Thursday, June 9th, 2011 AT 11:52 PM

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