air conditioning will not blow out dash vents, it switches on its own and blows out the defroster
Jul 5, 2008 at 8:14 AM
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2CARPRO JACK
CERTIFIED EXPERT
11,533 POSTS
Check the source vacuum under the hood, should be a small black plastic line that goes from the engine to teh interior, it enters the truck at the HVAC plenum box on the pass side