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

2008 CHEVROLET UPLANDER
169,000 MILES • 3.9L • V6 • 2WD • AUTOMATIC
Avatar
TED FINLEY
  • MEMBER
  • 10 POSTS
New fans, comes as AC and radiator fans. checked relays. when ground check relay fans come on high speed. just replaced transmission new.
Apr 27, 2019 at 7:17 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
Advertisement
Avatar
ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 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
Images (Click to enlarge)
Attached Media
Attached Media
Attached Media
Apr 27, 2019 at 9:42 AM
Advertisement
Avatar
TED FINLEY
  • MEMBER
  • 10 POSTS
Checking now. think I checked this relay, but will check again. thanks
Apr 27, 2019 at 1:52 PM
Avatar
ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 POSTS
Sounds good. Keep us updated.

Roy
Apr 27, 2019 at 1:58 PM
Avatar
TED FINLEY
  • MEMBER
  • 10 POSTS
checked fuse, checked relay okay.
Apr 27, 2019 at 6:37 PM
Avatar
ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 POSTS
Did you do what I suggested with the sensor connector?

Roy
Apr 27, 2019 at 7:04 PM
Avatar
TED FINLEY
  • MEMBER
  • 10 POSTS
Yes.
Apr 29, 2019 at 7:47 AM
Avatar
ASEMASTER6371
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 52,796 POSTS
And the result.

Roy
Apr 29, 2019 at 8:20 AM