96 gmc sierra 2500, blower only works on high setting.

2012 GMC C2500
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SBOLTON36
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  • 1 POST
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.
Jul 27, 2007 at 1:45 PM
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CLY
  • ✓ASE Certified Mechanic
  • 308 POSTS
  • ASE Certified Mechanic
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
Jul 27, 2007 at 3:41 PM
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