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When you adust the switch on your dash to direct the heated or cooled air you are actually switching vaccum to vaccum servos that open and close the doors within your heating/cooling system. If you drop your glove box door you can see behind it to witness this happening. You may need to remove some of the plastic dash covers also which is easy to do.You may have a bad vaccum line, vaccum switch or if they are all working, you may have a broken door within the system.

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โˆ™ 2005-10-08 00:59:44
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Q: How do you fix an air conditioning problem where most of the air gets directed to the floor vents instead of the main vents and defrost vents in a 2000 Chevrolet Malibu?
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