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Front blowers for heat not working

Tiny
MARK IACOPELLI
  • MEMBER
  • 2007 CHEVROLET UPLANDER
  • 160,000 MILES
My front blowers for the cabin don’t work. I was told by a more mechanically inclined friend that it’s probably the blower motor of resistor. I replaced the blower motor but didn’t work. Occasionally if I hit a bump just right the blowers kick on. The rear cabin blowers work fine. Could it still be the resistor? When they do kick on they seem to change speeds fine.
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Sunday, October 27th, 2019 AT 11:13 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Hello,

You replaced the blower motor correct? It sounds like it is going bad. To be sure lets use this guide to see if it is getting power/ground:

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

This blower wiring will show you how the system works. There is a blower relay that needs to be checked as well.

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

Here is the location below. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Monday, October 28th, 2019 AT 6:05 PM
Tiny
MARK IACOPELLI
  • MEMBER
  • 2 POSTS
Yes, I replaced the blower motor thinking that was the problem. In hindsight I this it was fine. I will go through the steps you suggested an see what I find and let you know. Winter is coming and I am not prepared.
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Tuesday, October 29th, 2019 AT 10:07 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Yep, check for the relay failure first. Let me know.
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Tuesday, October 29th, 2019 AT 10:51 AM

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