Air not blowing

2005 CHEVROLET TRAILBLAZER
210,000 MILES • 4.3L • 6 CYL • 2WD • AUTOMATIC
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ROBJUAN14
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I had no heat so I changed blower motor and resister. But before I did that I disconnect the battery. I reconnect the battery and heat worked. Let sit overnight then started with no air blowing. I checked resister harness and looks good. All fuses look good. Any help is appreciated.
Jan 7, 2018 at 4:59 PM
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STRAILER
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Hello,

When you say resistor do you mean the blower fan control module? We must be losing power somewhere are the trigger from the controller. Here is a guide to help us see whats wrong:

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

Below are the wiring diagrams so we can do some easy testing to find out what is wrong.



Let us know what happens and please upload pictures or videos of the problem.

Cheers, Ken
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Jan 9, 2018 at 1:39 PM