Air Mix Actuator Description

WARNING: This page is about a different car, the 2002 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

The air mix actuator is operated by signals from the climate control unit, and opens and closes the air mix doors.
The air mix actuator is equipped with a potentiometer that is linked to the motor.

System wiring diagram

Fig 1: Air Mix Actuator System Wiring Diagram

Courtesy of MAZDA MOTORS CORP.

Operation

The CPU of the climate control unit decides the voltage of the target based on the input signal of the switch.
When the voltage of the target is high compared with the detected voltage, the CPU rotates the motor of the motor in the direction of COLD.
When the CPU detects the target voltage, the motor is stopped.

Fig 2: Air Mix Actuator Operation Diagram
Courtesy of MAZDA MOTORS CORP.