For 1990-2009 cars
Case Upper: Contains the air inlet housing, blower motor resistor recirc door and motor.
Rotary Mode Valve and Seal Assembly: Cloth covered air distribution valve contained within its own case or housing.
Heater Valve and Seal: Part of Mode Valve case assembly.
Case Cover Heater Core: Contains the Heater Core and pipe assembly.
Case Lower: Contains the Heater Tube Case Cover, Blower Motor, Temperature Valve and Seal Assembly, Evaporator Core and Filter assembly.