Mechanics

96 SIERRA 2500, BLOWER ONLY WORKS ON HIGH SETTING.

2012 GMC C2500

I have replaced the blower/heater control unit, it didnt help, the relay behind the glovebox seems to work ok. I unhooked the wires from the blower motor and voltage only gets through when the blower is on high setting. I am now at a loss, where do I look next. Any suggestions would be greatly appreciated.
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Sbolton36
July 27, 2007.



The lower blower motor speeds run through a resister. The high speed blower voltage does not. You have a bad resister and that is why the blower only works on high.

Cly

Tiny
Cly
Jul 27, 2007.