Cooling fan not working

1998 CADILLAC DEVILLE

155,000 MILES • 4.8L • V8 • 2WD • AUTOMATIC

KMEYER78

MEMBER
1 POST
FOLLOW

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

Oct 21, 2015 at 7:09 AM

SQM

CERTIFIED EXPERT
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.

Images (Click to enlarge)

Aug 4, 2021 at 7:37 PM