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Q: Why does my A/C only blow through the defrost vent? No matter what vent I select on 1995 Jeep Grand Cherokee

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It doesn't matter what vent setting is selected, it only blows out of the defrost vent.
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yep! and it's probably on the pas. side fender area---use your ears (while it's running) listen for hissing sound. May have to open up soe of the corrugated tubing that covers a lot of wires and plastic multi colored vacuum tubes in that area. most likely hard plastic line NOT typical rubber vacuum hose.