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2001 Pontiac Grand AM- Cooling fans

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Old 10-07-2018, 06:08 PM
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Default 2001 Pontiac Grand AM- Cooling fans

I have a 2001 Pontiac Grand Am, 3.4L V-6. The cooling fans for the radiator will only come on when the A/C is turned on. Could it be a faulty relay? Does anyone have a wiring schematic they could share?
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Old 10-08-2018, 12:19 AM
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Well it is good that they do work when A/C is turned on! If I remember correctly, the fans wont normally kick on until the temp sensor reads around 225F.
Does your car over heat when stuck in traffic or at idle?


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Old 10-08-2018, 01:31 PM
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I think low speed is 221F, hi speed 235F....

As you can see from Soft Ride'* diagram, with lo speed, only the #1 relay is grounded, this put both fans in series, putting 6 volts on each fan...for hi speed, all three relays are grounded, changing the circuit from series to parallel and each fan gets 12 volts....
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Old 10-15-2018, 11:18 PM
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Thanks for the replies. I just bought the car and haven't had time to begin diagnosis yet. The previous owner said it ran fine around town but tended to run hot when under a load like climbing a long hill. He thought the radiator was partially plugged but again I haven't had a chance to check it out yet. I will update you once I get working on it, hopefully this weekend. He drove the car to my house (about two miles) and I took it for a drive, then let it idle while I looked it over and the temp gauge stayed steady at 220 degrees and both fans were running, with the a/c turned on.
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Old Yesterday, 12:56 AM
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Originally Posted by itsdiz View Post
tended to run hot when under a load like climbing a long hill
Have you seen it run hot climbing a hill etc.?

Have you checked for obstructions in the condenser and radiator like filled with hay or bugs or birds or deer?
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