Front blowers for heat not working

2007 CHEVROLET UPLANDER

160,000 MILES

MARK IACOPELLI

MEMBER
2 POSTS

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.

Oct 27, 2019 at 11:13 AM

STRAILER

✓ASE Certified Mechanic
54,832 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.

Images (Click to enlarge)

Professional Diagram for 2CarPros Members
Click here to log in and view diagram.

Oct 28, 2019 at 6:05 PM

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.

Oct 29, 2019 at 10:07 AM

STRAILER

✓ASE Certified Mechanic
54,832 POSTS

Yep, check for the relay failure first. let me know.

Oct 29, 2019 at 10:51 AM