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Cooling fan not working

Tiny
KMEYER78
  • MEMBER
  • 1998 CADILLAC DEVILLE
  • 4.8L
  • V8
  • 2WD
  • AUTOMATIC
  • 155,000 MILES
My car is overheating it is a 98 Cadillac Deville I believe it is the fans I let it idle up to 221 degrees and the 2 electric fans did not kick on I am assuming the fans should kick on around 200 degrees the only fuse box I can find in the car is under the hood on the drivers side and I can not find a fuse for those fans. Is there a second fuse box that I have not been able to locate? Is there even a fuse for those fans? I would appreciate any help you can give me thanks
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Wednesday, October 21st, 2015 AT 7:09 AM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

This vehicle has 3 cooling fan relays. They are located right behind the cooling fans (see diagram below).
The relays can be tested to see if they are indeed bad:

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

Another item to check would be the coolant temperature sensor. The sensor sends the signal of when to start the fans.

https://www.2carpros.com/articles/how-an-electric-cooling-fan-works
https://www.2carpros.com/articles/replace-electric-fan-motor

I have attached the coolant temp sensor location as well as replacement procedure for your reference.

Please let me know of any questions.

Thank you.
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Wednesday, August 4th, 2021 AT 7:37 PM

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