Question about 1988 Chevrolet K1500

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1988 1500 series half ton. Air vents to mid dash and defroster won't open up. Heat and air blows on the floor only.

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It sounds like the door on the defroster isn't opening. Check for a vacuum leak and also check the temp.control valve this should have several vacuum hoses coming from it. This valve controls all the doors, Bi-level, Defroster, and Floor positions.

Posted on Oct 07, 2009

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