Question about 2003 GMC Yukon XL
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Posted on Jan 02, 2017
Not sure about your exact model but a lot of these are vacuum actuated. If one of the vac lines is broken, leaking or disconnected this will happen. Maybe take look under the dash to see if something is obvious while you try to switch it - look and listen, good luck.
Posted on Mar 29, 2009
Is it a new vehicle? I had a new vehicle that had the same problem. Answer was that the holes weren't punched out of the vent.
Posted on May 23, 2009
Turn your AC off. Turn the car off Crank the car turn ac on drivers side to 60 passenger side to 90 press auto wait 1 minute turn AC off (very important) turn car off turn car back on switch driver's side 90 passenger 60 press auto wait one minute turn AC off( very important) turn car off turn car on AC 70 both sides press auto your ac should be blowing cold If not, you have an expensive problem
Posted on Aug 12, 2009
Probably the left temp actuator. The wires in the right I/P junction block could have poor tension also, but it's usually the temp actuator.
Posted on Oct 02, 2009
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