AIR CONDITIONER OF VEHICLE

PURPOSE:To prevent supply air from being varied in temperature when a plurality of supply ports are changed over by constituting an air conditioner to have both an air mix door opening detecting means which detects the opening degree of an air mix door by use of the specified characteristics depending on changed-over one of the supply ports, and an opening degree adjusting means which regulates an opening degree which is detected by said detecting means to coincide with a target value. CONSTITUTION:An air mix door opening degree detector 24' consists of variable resistors R1 and R2 which are operated in accordance with variation in stroke of a power servo 8 driving an air mix door 7. The resistance characteristics of said resistors are made to coincide with the characteristics of temperature of air supplied from each supply port. When a temperature inside a car room is set by a room temperature setter 15, a target supply temperature is calculated by a circuit 19. An opening degree is then calculated by a circuit 21 and the circuit 21 further selects a certain port and generates a supply signal. Providing the selected supply port may be a port 9, an actual opening degree signal S1 is selected by a change-over circuit 26 and then sent to a comparator 25. The comparator 25 generates a signal in accordance with a difference between the actual opening degree and the target value so as to have both degrees coincide with each other. A power servo is then driven by said signal.