Cooling fan does not turn on

1994 CADILLAC DEVILLE
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DICKWHYTE
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  • 1 POST
I have a 4.9 engine with 150,000 miles. The cooling fan will not come on. I have changed the sensor but it still will not come on. What should I do?
Sep 29, 2007 at 11:59 AM
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BUZZSAW
  • ✓Experienced Mechanic
  • 1,198 POSTS
Hello,

There are three cooling fan relays and a 50 amp maxi fuse that needs to be checked. Here is a guide to help you do some testing with a wiring diagram so you can see how the system works:

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

Check out the diagrams (below). Let us know what happens and please upload pictures or videos of the problem.

Cheers
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Nov 26, 2019 at 10:44 AM
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BISCUIT
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I had this problem it ending up being the coolant fan relays and the fan motor. FYI
Nov 26, 2019 at 10:44 AM
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