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Cooling fans run whenever the car is running?

Tiny
R.LATOUR
  • MEMBER
  • 2001 BUICK PARK AVENUE
  • 3.8L
  • V6
  • 2WD
  • AUTOMATIC
  • 147,000 MILES
Hi, the cooling fans run whenever the car is running. I have changed the coolant temperature sensor and the fan relays #31, #34 and #35 but the fans still run whenever the engine is running.
Tuesday, January 23rd, 2024 AT 8:38 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,932 POSTS
Do the fans run when the HVAC system is off? If so the fan control driver inside the PCM has gone out. Here are the wiring diagrams so you can see how the cooling fan system works and the location of the PCM. You can get a rebuilt unit by searching google or Ebay. Check out the images (below). Please let us know what happens.
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Tuesday, January 23rd, 2024 AT 11:20 AM

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