Cooling Fans Not Working

2005 CHEVROLET VENTURE
69,700 MILES • 6 CYL • FWD • AUTOMATIC
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SETLOCB
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  • 13 POSTS
My cooling fans are not working. They do work when the A/C is on. I checked all fuses, they are ok. I changed the relay's and changed the coolant temp. sensor. What else could the problem be?
May 30, 2008 at 10:46 AM
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LEGITIMATE007
  • ✓ASE Certified Mechanic
  • 5,121 POSTS
  • ASE Certified Mechanic
thermostat may not be opening to let the coolant rush by the engine coolant temp sensor, try a new thremostat
May 30, 2008 at 2:28 PM
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SETLOCB
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  • 13 POSTS
Thanks for answering my question. That's exactly what I just finished up with, changing the thermostat. No luck though. The fans still not working. There's not much left to check besides the PCM. Is there a way I can test that myself, or is that something I should have a garage check? Thanks again.
May 30, 2008 at 8:16 PM
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LEGITIMATE007
  • ✓ASE Certified Mechanic
  • 5,121 POSTS
  • ASE Certified Mechanic
so the fans still won't come on, even when the temp gauge reaches the red area? if this is the case then yeah have a garage check the pcm.

Read these guides, they will help you figure this out

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

https://www.2carpros.com/articles/how-to-check-wiring

The wiring diagram for your cooling fans is attached below
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Professional Diagram for 2CarPros Members
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May 30, 2008 at 11:07 PM
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