Question about 1996 Jeep Grand Cherokee

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Heater control unit is working but the defrosters are not blowing out of dash i can get heat on the floor boards but not on dash please help i am at a lose

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I believe this control uses vacuum to operate the different doors that direct air flow. Carefully while engine is running listen for hissing noises under dash while changing control to each position. If no changes in noises are heard then pinpoint leak . If there is no hiss then check under hood for a leak in the source line for control head.

Posted on Jan 18, 2009

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