Help... Tahoe Air Conditioner & Vent

2002 Tahoe The air conditioning vents on the dash have stopped working... The defroster and floor vents still work. The air that is supposed to be coming out the dash vents is now coming out of the floor
vent.
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Vacuum leak in the door motor. The def/flr vents still work because those are on a separate 2-stage vacuum motor. When a leak occurs in the vacuum system, the def vent is the 'default' position. Check for a bad vacuum hose connection/cracked hose/faulty motor.
Dave S(Texas)
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