Question about 1994 Jeep Grand Cherokee

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A/c goes from vents to defrost under acceleration

I have a 96 jeep grand cherokee and this just started the other day. when I left off the gas or drive down a hill, it will come back down to the vents but will go back to the defrost when I get back on the gas.

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Sounds like a vacuum problem.Listen for hiss noise under hood and under dash. may have a bad vacuum diaphram that controls blend door or leaking vacuum line.

Posted on Jul 26, 2009

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OK I have the same vehicle and it is designed to do this to help keep from overheating while going uphill and also to help give the engine more power when accelerating.

Posted on Jul 27, 2009

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