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Electric cooling fans not working

Tiny
WALT SARKOZY
  • MEMBER
  • 1995 BUICK ROADMASTER
Electrical problem V8 Two Wheel Drive Automatic 140000 miles

primary fan comes on with ac on. Secondary fan not coming on at all. Relays and fuses are good. Temperature switch replaced. Could the ecm be bad? THANKS!
Friday, July 9th, 2010 AT 10:46 PM

4 Replies

Tiny
BLUELIGHTNIN6
  • MECHANIC
  • 16,542 POSTS
The fan's motor is more likely to be bad then the computer, test the motor by supplying 12v direct power to it.
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Friday, July 9th, 2010 AT 10:52 PM
Tiny
WALT SARKOZY
  • MEMBER
  • 2 POSTS
Yes both motors work when connected to the 12 volts. Its strange that the the primary fan comes on only when the ac is on. The secondary fan is supposed to do that but the secondary fan is not coming on at all. Thanks!
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Saturday, July 10th, 2010 AT 5:51 PM
Tiny
CHARLES NOBLE
  • MEMBER
  • 1 POST
I hooked up a engine cooling fan switch to a pink ignition wire under the dash with the fan on when I turn the motor off it wants to keep running
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Monday, July 17th, 2017 AT 4:00 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 43,048 POSTS
Hello,

I would just connect the fans correctly to solve the problem. Here is some guides and a wiring diagram (below) that will help you get the job done.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

and

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

Please let us know what you find.

Cheers, Ken
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Tuesday, July 18th, 2017 AT 10:32 AM

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