Question about 1998 Jeep Grand Cherokee

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My air stays on defrost and floor after some time the air go's good for one min

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If you have the manual a/c heat system the vent controls run off engine vacumm. If it goes to defrost when accelerating then you have a vacumm check valve that is faulty, if it is a permanent problem you may have a broken or leaky vacuum line or faulty control head(unit with knobs, ect)

Posted on Jul 29, 2009

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