Radiator fans are not working?

Tiny
ANONYMOUS
  • MEMBER
  • 2002 JEEP GRAND CHEROKEE
  • 162,000 MILES
My radiator fans are not working can u tell me how to fix them?
Tuesday, January 15th, 2013 AT 2:41 AM

1 Reply

Tiny
SQM
  • MECHANIC
  • 6,383 POSTS
Hello,

The radiator cooling fan used on the 4.0L engine is an hybrid fan design.
The hybrid fan system consists of a low speed viscous driven mechanical fan and an electrical fan.

The fan can become inoperative due to a bad relay, module or the fan itself can the faulty.

You should check the relay first. It can be tested:

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

Here are couple of helpful articles:

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

I have attached the diagrams for the fan as well as relay and the module.

Please let me know of any questions.
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Wednesday, August 4th, 2021 AT 10:09 PM

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