Abstract: An air conditioning system for a vehicle includes an air conditioning unit mounted in a front side of the vehicle to condition air in a front seat area, a rear air outlet, a rear duct to connect the air conditioning unit and the rear air outlet, a rear fan provided near the rear air outlet to draw air from the air conditioning unit via the rear duct so that the air is blown from the rear air outlet, an air inlet provided in the rear duct to draw air from a cabin of the vehicle into the rear duct, and a door structure provided at the air inlet to adjust an opening level of either or both of the air inlet and the rear duct so as to adjust an air intake amount from the air conditioning unit and an air intake amount from the air inlet.

Abstract: An airconditioning system for a vehicle includes an airconditioning unit mounted in a front side of the vehicle to condition air in a front seat area, a rear air outlet, a rear duct to connect the airconditioning unit and the rear air outlet, a rear fan provided near the rear air outlet to draw air from the airconditioning unit via the rear duct so that the air is blown from the rear air outlet, an air inlet provided in the rear duct to draw air from a vehicle cabin into the rear duct, and a door structure provided at the air inlet to adjust an opening level of either or both of the air inlet and the rear duct to adjust an air intake amount from the airconditioning unit and that from the air inlet.

Abstract: A vehicle air-conditioning system includes an air-conditioning amplifier unit being connected to a plurality of door actuators through one communication and one power line; and the air-conditioning amplifier unit having first door-operation self-diagnostic means which sends to the door actuator target stopping position data for bringing doors in a full-open condition or full-close condition; if there is a change in an instruction value, after the lapse of a preset period of time which takes into account the time period required for the door to arrive at a target position and a lag in communication, the self-diagnostic means determining that the doors are in a normal condition when the signal returned from the door actuator represents that the doors are in a stopped state but determining that the doors are in an abnormal condition when the signal represents that the doors are in an actuated state.