Auxiliary System Airflow
WARNING: This page is about a different car, the 2017 Lincoln Navigator and 2017 Ford Expedition. However, it is still accessible from the selected car via links, so may be relevant.
The auxiliary blower motor recirculates the air inside the vehicle. Outside air is not available to the auxiliary system. The temperature blend door and the airflow mode door are controlled by electric actuator motors. The auxiliary system air can be cooled below interior air temperature only when A/C compressor operation has been requested by the settings of the climate control assembly of the base (front) system. The auxiliary system air can be heated at any time.