Coolant fans don't come on?

Tiny
CONNIE1
  • MEMBER
  • 1998 CHEVROLET VENTURE
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
Electrical coolant fans don't come on. Does mini relays go bad?
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Wednesday, March 11th, 2009 AT 8:56 AM

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Tiny
SQM
  • EXPERT
Hello,

A cooling fan might not come on for few reasons. First of all it can be a bad fan motor, it could be the ran relay or it could be the temperature sensor.

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

The relay for the cooling fan is located in the junction box under the hood.
You need to test the relay and make sure if it is good. Sometimes you will have the pin(s) on a relay burnt.

Here is how to test the relay:

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

It could also be a wiring issue.
I have attached the cooling fan wiring schematics for your reference.

Please let me know of any questions.

Thank you.
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Thursday, August 5th, 2021 AT 8:49 PM

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