2005 GMC Sierra HVAC system

2005 GMC SIERRA
74,000 MILES • V8 • 4WD • AUTOMATIC
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MARNATI
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  • 2 POSTS
Air only blows through defrost vent. A/C works fine.
Jul 13, 2010 at 12:08 PM
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DOCFIXIT
  • CAR REPAIR CONTRIBUTOR
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Hi
Need to know if Automatic or Manual A/C. What needs to be done is system needs to be diagnosed with Scan Tool. Air flow controled by computer via actuator motors faul maybe in motor or sensor or limit switch.
Hope this helps
Thanks for donate
Jul 13, 2010 at 1:33 PM
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MARNATI
  • MEMBER
  • 2 POSTS
Had truck looked at and had the system "re-booted" seems to be working like new now. Thanks for help. Inexpensive fix!
Jul 14, 2010 at 9:35 AM
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DOCFIXIT
  • CAR REPAIR CONTRIBUTOR
  • 18,828 POSTS
Glad to hear thought that might be needed cause you said A/C worked fine just only defrost.
Jul 14, 2010 at 3:10 PM