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96 GMC Sierra 2500, blower only works on high setting.

Tiny
SBOLTON36
  • MEMBER
  • 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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Friday, July 27th, 2007 AT 1:45 PM

1 Reply

Tiny
CLY
  • MECHANIC
  • 308 POSTS
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
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Friday, July 27th, 2007 AT 3:41 PM

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