Air-conditioning and/or heating device for the passenger compartment of a motor vehicle, with at least one actuator for a hinged flap

The heating system comprises an air conduit housing a shutter flap (20). This is moved by an actuator (28) fixed at several points (40a,b,c) on a reinforced part of a wall of the housing. The reinforced wall (12d) has reduced thickness zones (Za,b,c) surrounding each mounting for the actuator, reducing the transmission of the noise and vibration. The heating and/or air conditioning system for a vehicle comprises an air conduit having an external wall, housing a shutter flap (20) which is hinged about an axis (XX). This is controlled by an actuator (28) fixed at several points (40a,b,c) on a reinforced part of a wall of the housing. The reinforced wall (12d) has thickened ribs supporting the reinforced mounting points for the actuator, but immediately surrounding each of these points (40a,b,c) there is a reduced thickness zone (Za,b,c), reducing the transmission of the vibrations caused by the operation of the actuator. The reinforcement of the wall (12d) is achieved by a mesh of ribs (29), and the mounting points are formed at the intersections of these ribs.