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Q: Air Condition Problems on 1997 Pontiac Grand Prix GTP

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When I turned on my a/c the air is not blowing out of all the vents. Out of the five vents on two are blowing cold air. Now, is there some type of flapper door that is suppose to open and close depending on what you have the switch set on whether it a/c or heat? Also, when I have it on a/c and high cold air is blowing out of the defroster.
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