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the default for the air when there is a significant vacuum leak in the a/c system is to blow air thru the defrost vents.strangely though the defrost vacuum element is often the one to go bad.take out the glovebox and you can get access to the most prevalent offenders,the two elements that control the fresh air door and the defrost.if you are in a hurry you can use tie wraps to close the defrost and the fresh air to provide temp relief.
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