Quote:
Originally Posted by dougger
I have the Auto controls in my 05 Silverado and the blower just started acting up. I usually put it on Auto and Defrost and the led on the display goes all the way to high but the blower either blows on low or not at all. I have tried manually changing the speed and it does nothing. It just started doing this and I have also had it not be working and then all of the sudden it would start to blow. It has happened that when I leave in the morning for work it would be working, when I leave for lunch or after work it may not be working. It is just a 50/50 shot that it will work.
I know on my old 2000 silverado, I replaced a resister pack, just did not know if this on has the same thing since it is newer and has the Auto Controls.
Thank you.
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First step is to get a HAVC capable scan tool and get any codes and test it with the scan tool.
The fan is controled with a PWM voltage that needs a lab scope too test.
Reg volt meter will not measure voltage to it.