A/C vents not working

I need your help. I think I may have knocked a vacuum hose loose when I was pressure washing my XJ. When I turn on the a/c, the air flow only comes out of the defrost vents under the windshield, no matter where I turn the control knob to. The a/c works fine, the outside air fine and the temp control is ok, but it only comes out of the defrost vents. Where is the vacuum hose located that controls the vent positions? If anyone has any suggestions I would sure appreciate it.

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