Blower motor or blower motor resistor issues

EPICKET2

MEMBER
2006 CHEVROLET TRAILBLAZER
5.3L
V8
2WD
AUTOMATIC
190,000 MILES

Replaced blower motor resistor, while doing so the hot and ground wires accidentally touched. The fuse to the blower motor blew, so I replaced it and swapped out the new blower motor resistor. Plugged everything back up and the blower will not turn on. Is it possible I damaged the blower motor fan? Or what else should I check? I checked all of the fuses and they are all good. Thanks in advance! :-)

1 Reply

JACOBANDNICKOLAS

MECHANIC
109,700 POSTS

Welcome to 2CarPros.

At this point, if you know the fuse is good, we have to determine where the power is lost. I have provided a diagnostic flow chart below in the pictures. I had to break it into several pictures so you could read everything.

To test the system, you will need to use a test light and a volt meter or multi meter. Here are links to help you with using them:

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

https://www.2carpros.com/articles/how-to-use-a-voltmeter

https://www.2carpros.com/articles/how-to-check-wiring

Also, confirm there is power to the fuse you replaced.

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One last thought. Check relay 45 in the under hood fuse/relay box. You can either switch it with another relay with the same part number, or test it. Here is a link that explains how to test a relay. Picture 5 shows the relay I'm referring to.

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

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Let me know what you find or if you have other questions. I hope this is helpful.

Take care,
Joe

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