Climate Control Housing
WARNING: This page is about a different car, the 2018 Ford F-550 Super Duty, 2018 Ford F-450 Super Duty, 2018 Ford F-350 Super Duty, and 2018 Ford F-250 Super Duty. However, it is still accessible from the selected car via links, so may be relevant.
All airflow from the blower motor passes through the evaporator core. The airflow is then directed through or around the heater core by the temperature door(s) where it is then mixed and distributed to the selected outlet by the airflow mode doors.