I have a 2003 Yukon XL that was blowing heat from the passenger side while the a/c was on and is now blowing a/c'd air while the heat is on. I cant see how this would be a heater core problem.

Asked by Oct 01, 2013 at 09:39 AM about the 2003 GMC Yukon XL 1500 4WD

Question type: Maintenance & Repair

A/c is definitely on, I hear the compressor turning on and off.

1 Answer

1,580

air door control problem.

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