INTAKE DOOR SWITCHING DEVICE

PURPOSE:To compensate chilling ability of an evaporator and regulate the increase in the humidity in a car room and the introduction of smell or noise by introducing outside air by means of an intake door only when air blasting is small in quantity and outside air temperature is low. CONSTITUTION:An intake door 5 to switch air introduction conditions is driven by an actuator 6. The actuator 6 is controlled by a controlling means 100 according to the opening of an air mix door 16 detected by a detector 30 and the control data of a blower. In such device, the fact that the air blasting quantity of a blower is lower than the specified quantity is detected by a detecting means 200, and the fact that outside air temperature is lower than the specified value is detected by a detecting means 300. When the facts that both of the air blasting quantity of the blower and outside air temperature are lower than the specified value are detected by the detecting means 200 and 300 respectively, the actuator 6 is controlled by the control means 100 so as to position the intake door 5 at the full admission position.