2004 GMC Sierra a\c

Tiny
DBIMAGING1
  • MEMBER
  • 2004 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 135,000 MILES
What would cause your a\c to change to heat while you are driving? And this winter the heat would not work or it took forever for the air to get warm.
Saturday, May 28th, 2011 AT 9:27 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the air blend door and actuator, HVAC control module, also air and moisture could be in the AC system forming ice and blocking off the orifice tube needing to be purged out-
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Saturday, May 28th, 2011 AT 9:54 PM

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