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Cooling fan will not come on unless A/C turned on then only on low

Tiny
TED FINLEY
  • MEMBER
  • 2008 CHEVROLET UPLANDER
  • 3.9L
  • V6
  • 2WD
  • AUTOMATIC
  • 169,000 MILES
New fans, comes as AC and radiator fans. Checked relays. When ground check relay fans come on high speed. Just replaced transmission new.
Saturday, April 27th, 2019 AT 7:17 AM

7 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good afternoon,

Try this. Remove the connector for the cooling fans. Do this while the engine is running and see if the fan kicks on.

Check the fuses I circled in the diagram I attached for power as well.

Roy
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Saturday, April 27th, 2019 AT 9:42 AM
Tiny
TED FINLEY
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  • 10 POSTS
Checking now. Think I checked this relay, but will check again. Thanks
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Saturday, April 27th, 2019 AT 1:52 PM
Tiny
ASEMASTER6371
  • MECHANIC
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Sounds good. Keep us updated.

Roy
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Saturday, April 27th, 2019 AT 1:58 PM
Tiny
TED FINLEY
  • MEMBER
  • 10 POSTS
Checked fuse, checked relay okay.
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Saturday, April 27th, 2019 AT 6:37 PM
Tiny
ASEMASTER6371
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Did you do what I suggested with the sensor connector?

Roy
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Saturday, April 27th, 2019 AT 7:04 PM
Tiny
TED FINLEY
  • MEMBER
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Yes.
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Monday, April 29th, 2019 AT 7:47 AM
Tiny
ASEMASTER6371
  • MECHANIC
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And the result.

Roy
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Monday, April 29th, 2019 AT 8:20 AM

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