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Replaced Blower Motor Resistor, Now Blower Not Working

rwilly

By rwilly
in Ask A GM Technician

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rwilly New Member

rwilly

Posted
Posted

Hey all, I did some reading on this problem on this forum and others, and thought I had it figured out, but must not have. Looking forward to hearing your suggestions on this -- thanks!

 

 

Vehicle: 2005 Sierra SLT Crew Cab 4WD

 

 

Original problem: Blower motor jumped up to high speed all on its own one morning, then the blower motor continued to run, even when the vehicle was shut off - ran the battery dead. I installed a new blower motor resistor (bought from my local GM dealer), and thought I had fixed the problem - everything worked as it should for about 2 days.

 

 

New Problem: This morning, nothing blowing at all. Haven't had time to open up and look for any probems with the resistor I installed this weekend, but I am pretty sure everything (connections) are good.

 

 

Any ideas?

txab Senior Enthusiast

txab

Posted
Posted

GM is supposed to be repairing these free of charge, I believe. "04-'07 models. Might be some other criteria, like manual controls vs automatic

asc08 Enthusiast

asc08

Posted
Posted

If that was your issue, you should have replaced the resistor as well as the wiring harness connection to it. Had mine done at the dealer under the 'special warranty extension'.

jtstacy77 Enthusiast

jtstacy77

Posted
Posted
If that was your issue, you should have replaced the resistor as well as the wiring harness connection to it. Had mine done at the dealer under the 'special warranty extension'.

 

I would take it to the dealer to have it checked out under the special warranty on the blower motor resistor. I wouldn't mention the fact that you have tried to fix it yourself as they will probably try to blame it on you! Hopefully they can get it lined out for you.

wavery Enthusiast

wavery

Posted
Posted

Check the blower motor fuse. If you replaced the resistor without pulling the fuse, you may have blown the fuse.

 

If you didn't change the connector, it may be fried. If you look at the connector and it looks blackish in areas and/or slightly melted, the connector may be shorting inside.

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