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A slide door unit for an automotive air conditioner, has a door housing which has a concave inner surface and laterally opposed side walls. The side walls have arcuate guide grooves respectively. A slide door member has a convex outer surface slidable on and along the concave inner surface of the do

A slide door unit for an automotive air conditioner, has a door housing which has a concave inner surface and laterally opposed side walls. The side walls have arcuate guide grooves respectively. A slide door member has a convex outer surface slidable on and along the concave inner surface of the door housing. The slide door member has a concave inner surface. Racks are provided on laterally opposed sides of the concave inner surface of the slide door member. Guide pins are secured to laterally opposed ends of the slide door member. The guide pins are slidably engaged with the arcuate guide grooves of the door housing. A pinion gear unit includes two pinion gears and a shaft by which the pinion gears are connected. The pinion gear unit is rotatably held by the laterally opposed side walls of the door housing having the two pinion gears meshed with the racks respectively. A resilient structure is further provided, which is defined by each of the pinion gears of the pinion gear unit. The resilient structure biases the pinion gears against the racks thereby pressing the guide pins against bottom walls of the corresponding arcuate guide grooves when the pinion gear unit is properly held by the door housing.

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1. A slide door unit for use in an automotive air conditioner, said unit comprising:a door housing having a concave inner surface and laterally opposed side walls, said side walls having respective arcuate guide grooves; a slide door member having a convex outer surface slidable on and along the con

1. A slide door unit for use in an automotive air conditioner, said unit comprising:a door housing having a concave inner surface and laterally opposed side walls, said side walls having respective arcuate guide grooves; a slide door member having a convex outer surface slidable on and along the concave inner surface of said door housing, said slide door member having a concave inner surface; racks provided on laterally opposed sides of the concave inner surface of said slide door member; guide pins secured to laterally opposed ends of said slide door member, said guide pins being slidably engaged with said arcuate guide grooves of said door housing; a pinion gear unit including two pinion gears and a shaft by which said pinion gears are connected, said pinion gear unit being rotatably held by the laterally opposed side walls of said door housing having said two pinion gears meshed with said racks respectively; and a resilient structure defined by each of the pinion gears of said pinion gear unit, said resilient structure biasing said pinion gears against said racks, thereby pressing the guide pins against bottom walls of the corresponding arcuate guide grooves when said pinion gear unit is properly held by said door housing.