Air Door Actuator / Motor: Description and Operation

TEMPERATURE ACTUATOR POTENTIOMETER
The electronic blend door actuator is located in the side of the evaporator case assembly on the driver's side. The actuator controls the position of the temperature blend door based on a low current signal from the FATC module. Internally an electronic circuit accepts the signal and positions the blend door with a small DC motor. Also included is a blend door position potentiometer which provides feedback to the FATC module. The blend door actuator operates based on input information of the temperature setting lever signal and the in-vehicle, ambient, engine temperature sensor signal. The A/C control module actuates the DC motor according to these signals, also controls the motor operation to adjust the air mix-blend door opening.