1994 Jeep Grand Cherokee Logo
Posted on Jul 26, 2009
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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.

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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.

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