Heater Assembly
WARNING: This page is about a different car, the 1998 Isuzu Rodeo, 1998 Isuzu Amigo, and 1998 Honda Passport. However, it is still accessible from the selected car via links, so may be relevant.
The heater assembly houses the heater core and mode doors. Coolant flowing into heater core is controlled by a heater valve mounted on side of heater assembly.