2004 GMC ENVOY
164,000 MILES
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DCANDMC01
  • MEMBER
  • 1 POST
When I turn the heat on it takes a while for it to heat up also the vent in the back blows out warm air but never hot. The air condition works great but as soon as I turn the heat on, the air stops blowing hard and barely comes out. Any ideas what causes this?
Jan 14, 2013 at 1:48 PM
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HMAC300
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 48,601 POSTS
you have an actuator that is opening the door it needs to be checked. there are also 3 on lh side one of htos may not work. also pul havac fuse for 60 seconds and they may recalibrate.
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Jan 14, 2013 at 2:08 PM