Rear Climate Control Housing
WARNING: This page is about a different car, the 2016 Ford Transit Connect. However, it is still accessible from the selected car via links, so may be relevant.
The rear climate control housing directs airflow from the blower motor through the evaporator core and heater core. All airflow from the blower motor passes through the evaporator core. The airflow is then directed through the electric booster heater. After passing through the electric booster heater, the airflow is distributed to the selected outlet by the airflow mode doors.