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Cooling Fans will not turn on

Tiny
SHALEN WILLIAMS
  • MEMBER
  • 2008 CHEVROLET MALIBU
  • 2.4L
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 195,300 MILES
The cooling fans will not turn on causing the engine to overheat.

I have already replaced the engine coolant temperature sensor and both fan relays. I have tested the wires from the sensor to the ECM and ground and they are good. The fans come on 100% when I unplug the coolant temperature sensor for safe mode. I also replaced the relay for the air conditioner compressor and that system works correctly (I read that the two systems are connected).

I am at a loss, any help would be wonderful.
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Wednesday, July 27th, 2016 AT 8:48 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I am assuming you have checked the fuse as well for the fans along with the relays which you said you did. There are three relays for fans and ground is near #4 exhaust port. Also check ground for fans and diode might be messed up. See pictures.
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Wednesday, October 28th, 2020 AT 6:09 PM
Tiny
SHALEN WILLIAMS
  • MEMBER
  • 2 POSTS
Yes, I checked the fuses as well. I will check the grounds when I get off work this afternoon. If the ground was not connected wouldn't that keep the fans from coming on at all?
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Wednesday, October 28th, 2020 AT 6:09 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If the ground is poor or disconnected the fans wont work. The fan grounds may be on the header where radiator is bolted to.
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Wednesday, October 28th, 2020 AT 6:09 PM

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