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Overheating, cooling fans not working

Tiny
ZACH MUSICK
  • MEMBER
  • 2001 BUICK CENTURY
  • 3.1L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 142,000 MILES
Okay, let's start off with what I have done. I have replaced the following on my car listed above:

Radiator, radiator cap, cooling fans, water pump, heater core, engine temperature sensor, and relays.

After replacing/checking the above my cooling fans will now come on. But only when the A/C is running. They however still will not turn on when overheating. It will redline and the fans still will not turn on unless I run the A/C.
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Tuesday, May 10th, 2022 AT 5:11 PM

1 Reply

Tiny
BORIS K
  • MECHANIC
  • 762 POSTS
Hello,

I would suggest to load test the wiring from the PCM to the 3 fan control relays.
See wiring diagram attached below,
If wiring is found to be in order would suggest to test/replace the 3 control relays next,

How to test wiring,
https://www.2carpros.com/articles/how-to-check-wiring

How to check relays,
https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Hope this helps,

Cheers, Boris
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Wednesday, May 11th, 2022 AT 5:51 AM

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