A/C only blows through defrost

2007 GMC SIERRA
55,000 MILES
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MY2007SIERRA
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  • 1 POST
My A/C only blows through defrost vents. Upon initial startup itll blow from regular vents but after about a minute or two itll only blow through defrost, no matter what setting it is on. At first it would only blow cold from drivers side and warm on passenger side, but after a while it only blows cold through defrost vents.
Jun 22, 2012 at 8:30 PM
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RASMATAZ
  • ✓ASE Certified Mechanic
  • 75,992 POSTS
  • ASE Certified Mechanic
Have the mode actuator and the HVAC control module checked/tested
Jun 22, 2012 at 8:47 PM
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