Air Distribution Damper Stepping Motor

WARNING: This page is about a different car, the 2001 Saab 9-3 and 2000 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.

Air distribution damper stepping motor is located on evaporator case, behind ACC control module. See Figure . There are 2 windings in stepping motor. A voltage is applied to the windings in a special order with short pulses, causing the motor to move in short steps. The direction of motor rotation can be changed. When motor is stationary, current is applied continuously to both windings to lock motor. Air distribution damper directs airflow to various air ducts.

Calibration of damper stepping motor must be carried out if the battery has been disconnected or discharged, if the ACC control module or stepping motor has been replaced, or if stepping motor damper position has been changed. See ACC CONTROL MODULE CALIBRATION under PROGRAMMING.

Floor and panel/floor mode settings are not used in AUTO mode. If required mixed-air temperature is high, air distribution will be set to the defrost/floor position. If required mixed-air temperature is low, air distribution will be set closer to the defrost position. If required mixed-air temperatures are extremely low, air distribution will be set to the panel position.

The desired air distribution can also be selected manually on the ACC control module. Air distribution is shown by means of symbols on ACC control module display.