2004 gmc sierra a\c

2004 GMC SIERRA
135,000 MILES • V8 • 4WD • AUTOMATIC
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DBIMAGING1
  • MEMBER
  • 1 POST
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.
May 28, 2011 at 2:27 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 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-
May 28, 2011 at 2:54 PM
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