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When I turn the heat on it takes a while for it.

Tiny
DCANDMC01
  • MEMBER
  • 2004 GMC ENVOY
  • 164,000 MILES
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?
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Monday, January 14th, 2013 AT 1:48 PM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 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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Monday, January 14th, 2013 AT 2:08 PM

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