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Radiator fan running constantly

Tiny
AHCNWV
  • MEMBER
  • 2008 CHEVROLET UPLANDER
  • 3.9L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 76,000 MILES
My vans cooling fan is constantly running. Is there any specific way to test the relay to see if they are bad. There are two fans that constantly run.
Monday, November 10th, 2014 AT 3:10 PM

8 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hey AHCNWV1,

It sounds like the relay is stuck on which is common problem, here is a diagram to show you where there are and how to test them.

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

Please let me know what happens so it will help others.

Best, Ken

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Thursday, January 19th, 2017 AT 8:11 AM
Tiny
THEWOLF
  • MEMBER
  • 2 POSTS
Thanks, it was the relay on my car cost me $35.00
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Tuesday, November 26th, 2019 AT 7:08 PM
Tiny
JLCSEW
  • MEMBER
  • 1 POST
  • 2008 CHEVROLET UPLANDER
  • 3.9L
  • V6
  • FWD
  • AUTOMATIC
  • 82,000 MILES
My cars cooling fan runs constantly when the ac is on or when I am using defrost. I saw that I should check my realys but how do I do that?
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Tuesday, November 26th, 2019 AT 7:09 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
You don't have t check anything. That is the way it is designed to operate. It is required whenever the AC compressor is engaged and it is engaged in defrost mode to remove moisture.
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Tuesday, November 26th, 2019 AT 7:09 PM (Merged)
Tiny
CURTISAUTO
  • MEMBER
  • 7 POSTS
  • 2007 CHEVROLET UPLANDER
  • 6 CYL
  • AUTOMATIC
  • 90 MILES
Cooling fans run all the time on this vehicle 10 seconds after startup A/c not on and defrost or heat not on
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Tuesday, November 26th, 2019 AT 7:09 PM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
Here is the description of how the fans should work. If they are not working this way, then you may have a problem with one of the relays.
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Tuesday, November 26th, 2019 AT 7:09 PM (Merged)
Tiny
2CP-ARCHIVES
  • MEMBER
  • 4,540 POSTS
  • 2005 CHEVROLET UPLANDER
They cooling fan does not stop, through out driving. Thnks
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Tuesday, November 26th, 2019 AT 7:09 PM (Merged)
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Your possible causes here could be a shorted wiring, relay sticking, coolant temperature sensor out of calibration and last the computer control circuit of the fan relays-See below cooling fans circuitry
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Tuesday, November 26th, 2019 AT 7:09 PM (Merged)

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