2002 GMC ENVOY
105,000 MILES
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SGTMAJ28
  • MEMBER
  • 1 POST
when heater is on cold air comes out of drivers side vents passenger vents have warm air copming out
Nov 28, 2012 at 3:07 PM
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HMAC300
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 48,601 POSTS
one of the actuators is screwed up it's eitehr the actuator or the door is broken or it's not getting power which would mean the control module. they are 1/&2 on drawing.
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Nov 28, 2012 at 4:27 PM