2005 GMC Envoy Logo
Posted on Feb 26, 2010
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My heater and AC blower not working. Please help

My heater and AC blower not working. Please help

2 Answers

Anonymous

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  • Master 593 Answers
  • Posted on Feb 26, 2010
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In the fuse block,under the hood on top of the fender. Locate fuse #35 it's 40amp fuse for the blower moter. If the fuse is ok,there is another
common problem you can check. The blower moter resistor assembly,
located under the dash on right side. With a 12v test light check for
power to the blower moter from the resistor. If you have no power to the
moter, replace the resistor assembly. If niether of these works, I'll need
to know if you have climate control or manual control hvac. And for some reason, the wheel base. long wb or short wb. to dig any deeper.
But I hope one of the causes I've mentioned will cure the problem.
Good luck.

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  • Master 1,515 Answers
  • Posted on Feb 26, 2010
Anonymous
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Hi, if the blower doesn't work on heat and air, I would check the fuse and or relay under the hood. It is located in a black plastic box marked Electrical fuses.If its a fuse locate it as it should be marked and it will have a metal strip across the top inside. Look for this strip to be burned in half or blackened from shorting out. It should be about a 25 to 30 amp fuse. If it shows a relay for the blower motor, you can change it with one of the same kind next to it on a temporary basis to see if it works. If so, pick one up at your auto parts store and your set. Good Luck.
Shastalaker7

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Anonymous

  • 466 Answers
  • Posted on Aug 12, 2009

SOURCE: AC compressor works fine, Blower does not. How do you repair?

check the fuse in the fan-fan relay-check voltage at the terminals of the blower if you have the voltage problem is to check the blower motor of the blower speed control

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