Heater Core Housing
WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.
The heater core housing is mounted to the instrument panel side of the dash panel, and houses the heater core and temperature blend doors. The heater core housing is partitioned to provide separate temperature blend doors for the driver and passenger sides of the vehicle. All airflow from the evaporator core housing passes through the heater core housing before entering the plenum chamber for distribution.