Blend Switch

The rotary Blend Switch controls the full range of temperature that the rear system can produce in any mode. Rotating the switch results in the A/C-Heater Control Module signaling the actuator to move the blend door. A low temperature setting directs airflow to the overhead outlets, while a high temperature setting directs airflow to the floor outlets. All door positions are determined relative to the number of commutator pulses required to provide full travel of the door. On command, the A/C-Heater Control Module runs the actuator for the number of pulses corresponding to the desired door position.