Two days ago my heater or AC will only blow out.

Tiny
ANONYMOUS
  • 2001 GMC YUKON
  • 187,000 MILES

Two days ago my heater or ac will only blow out through the defrost vents. Rear air blows correctly. Cannot find diagram of vacuum hoses.

Friday, January 4th, 2013 AT 1:17 PM

1 Reply

Tiny
HMAC300
  • EXPERT
  • 47,000 POSTS

First try pulling fuse for hvac for 60 seconds then see if that fixes it, sometimes it does. Then check item 3 & 7 in attached drawing.

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Friday, January 4th, 2013 AT 3:31 PM

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