Question about 2002 GMC Envoy

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I got a new battery put in my envoy, and now the heater only blows out the defrost and stays on hot, it won't let me regulate the temp or where the air comes out. please help. and my auto start will not work now either.

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  • GMC Master
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Hi, please try a recalibration of the system as follows:

  1. Remove the HVAC B fuse (in the rear fuse block) for a minimum of 10 seconds.
  2. Install the HVAC B fuse.
  3. Start the vehicle.
  4. Wait 40 seconds for the HVAC control module to self-calibrate.
If this doesn't work, please get back to me.

Posted on Apr 10, 2011

  • Freddy Jul 14, 2011

    Before removing fuse all HVAC controls and switches should be set to OFF or CCW positions. This will allow the recalibration to work correctly.

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