Auxiliary fan not working

1991 JEEP CHEROKEE
160,000 MILES • 4.0L • 6 CYL • 4WD • AUTOMATIC
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MARKO1974
  • MEMBER
  • 3 POSTS
My vehicle has a fan operated by the engine and pulleys but there is also an auxiliary fan and that is not coming on. Sometimes the temperature gets above normal so I went to AutoZone to see if they list a cooling fan switch or sensor and no they do not list one. So I am wondering where else to look. Is there a relay or something else to look for? If so what is its location? Thanks for your help.
Nov 4, 2018 at 5:46 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,560 POSTS
Hello,

It sounds like the relay is bad or the fan is bad. Here is a guide to help you run some test and the fan wiring diagrams so you can see how the system work with the relay location:

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

Check out the diagrams (below). Please let us know what you find.

Cheers, Ken

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Nov 5, 2018 at 8:25 AM
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