Control Assembly: Description and Operation

The heater assembly is a blend air system and consists of a heater assembly, blower assembly and duct which is connected between the heater case and blower case. The heater case contains the heater core and the temperature blend door. The blower assembly containing the outside/recirculating air door, the blower motor and the lower wheel is connected directly to an opening in the upper cowl.The outside air is drawn into the system from the cowl through the blower inlet in the blower housing, forced through and/or around the heater core, mixed and then discharged through outlets in the discharge air duct to the floor area or through the defroster outlets depending the type of air intake control button selected.There are two types of the control assembly, the vacuum rotary and manual lever type.