Question about 2003 GMC Yukon XL

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GMC 2003 truck heater/ac not consistent.

The air will blow out of the front vents and then switch to the defrost vents after about a minute or so and then back. When using ac the passenger side vents are blowing out heat. Help!

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Check for any vacumm hose leaks that comes from the engine to the ac box, check for vacumm actuator proper operation.

Posted on Jul 21, 2009

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