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2003 gmc Yukon 5.3 ..2WD air conditioner blows

2003 gmc Yukon 5.3 ..2WD air conditioner blows cold air out of floor vents and defroster vents but not the vents in the dash

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A vacuum hose that controls the little door that switches where the air blows from is off, its gonna be a real chore the find which one and take the dash out to get to it, but you might get lucky and be able to look underneath the dash from the passenger side and actually see it, good luck

Posted on Jun 19, 2010

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I believe this vehicle uses stepper motors to control the vents, not vacuum lines.
A stepper motor reports back to the control module what position each flap door is in. (i.e. heat, cold, loor, defrost, etc.) When power is lost, the module forgets these positions. You will need to reset the AC system so that it relearns the positions of the doors. Search for "how to reset AC system" it involves pulling the fuses for the AC and reinserting them in a particular order so the system can determine the positions of the flap doors.

Posted on Jun 23, 2012

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Jan 21, 2016 | Cars & Trucks

1 Answer

Blows hot air on the floor but cold in the defrost


most likely leak in one or more of the vacuum lines and or out door air damper not closing

If you need further help, I’m available over the phone at https://www.6ya.com/expert/mike_9693b5ad75773352

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Bring to shop since you obviously do not know what you are doing.

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Could be a blockage in the lines to the rear unit.
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