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

It doesn't matter what vent setting is selected, it only blows out of the defrost vent.

Asked by for the 1995 Jeep Grand Cherokee
Vacuum leak to slector switch prob. under hood.
Good luck.
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.