Actuator, Blend Door: Operation

WARNING: This page is about a different variant/trim than selected.

The blend door actuator used in the Automatic Temperature Control (ATC) heating and A/C system is connected to the A/C heater control by a dedicated five-wire lead and connector of the Heating, Ventilation and Air Conditioning (HVAC) wire harness. The blend door actuator can move the blend-air doors in two directions. When the A/C heater control pulls the voltage on one side of the motor connection high and the other connection low, the blend door actuator will move in one direction. When the A/C heater control reverses the polarity of the voltage to the motor, the blend door actuator moves in the opposite direction. Once the A/C heater control makes the voltage to both connections high or both connections low, the blend door actuator stops and will not move.

The blend door actuator contains a potentiometer, which the ATC A/C heater control uses to monitor the relative position of the blend-air doors. The A/C heater control learns the blend-air door stop positions during the calibration procedure and will store a Diagnostic Trouble Code (DTC) for any problems it detects in the blend door actuator circuits. Refer to DIAGNOSTIC CODE INDEX .

The blend door actuator cannot be adjusted or repaired and must be replaced if inoperative or damaged.