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Blower fan stopped working?

Tiny
CHRIS QUEISER
  • MEMBER
  • 2006 CHEVROLET SUBURBAN
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 205,000 MILES
My blower fan quit working. I replaced the blower, resistor and head unit in the dash and wire harness. The blower works when it's out of its hole but once I mount it back in properly it won't work at all. Am I missing something?
Saturday, March 4th, 2023 AT 1:40 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,536 POSTS
Hello Chris,

It sounds like the power leads or ground is not working, here is a guide to show you how to test the power and ground lead to the blower motor. Turn the blower on high speed to check for power. Also check the BLWR fuse under the hood for power as well. If you test the ground wire (black) with the blower on and the wire lights up the test light the ground is bad.

https://www.2carpros.com/articles/blower-fan-motor-works-on-high-speed-only

and

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

Also, I have included the blower motor wiring diagrams so you can see how the system works. Check out the images (below). Please let us know what you find. We are interested to see what it is.

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Sunday, March 5th, 2023 AT 5:00 PM

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