The blower motor works intermittently?

2017 CHEVROLET SILVERADO
80,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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FLANDERSJOHN
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I have replaced it twice. After last replacement it worked fine for about 2 months then the problem returned. When not working I can sometimes get it to work by slamming the passenger door or banging the motor itself, sometimes it just starts working by itself. I have checked the wiring connections and they seem tight.
Mar 2, 2023 at 7:21 AM
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STRAILER
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Hello John,

It sounds like either the blower speed controller is going out or you have a bad ground which is located at the right front of the defrost deflector. When the blower is not working test the black wire for power using a test light, if it lights up the ground is bad. This guide can help, and I have included the blower motor wiring diagrams as well so you can see how the system works.

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

Check out the images (below). Please let us know what happens.
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Mar 3, 2023 at 9:32 AM
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FLANDERSJOHN
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Thank you for the information. Ken L was extremely helpful. I hadn't considered the possibility of a bad ground. I followed his testing procedure, found that the ground was indeed faulty, I was unable to easily fix the original ground due to its location so I ran a new ground. Problem fixed. Saved me a couple of hundred dollars. Again, thank you for the help.

John F
Mar 21, 2023 at 9:06 AM
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STRAILER
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Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.

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Mar 21, 2023 at 9:07 AM