Ceiling grille for rooftop air conditioner unit

The ceiling grille (10) is for directing conditioned air from an air conditioning unit mounted upon the roof of a motor vehicle into a plenum (12) located inside the vehicle. The plenum (12) has front and rear air distributors (16, 19) rotatably mounted therein for directing comfort air into the passenger compartment. Each air distributor has a rocker arm (49, 62) that is connected through suitable linkage to a cam follower (38, 39). Each cam follower (38, 39), in turn, rides on the cam face (40) of a motor driven cam (33). The profile of the cam (40) is contoured to position the two air distributors (16, 19) to control the direction of comfort air flow into the passenger compartment.