Control Assembly, HVAC

CLIMATE CONTROL ASSEMBLY
The heater is a blend air type that receives its outside air supply from the cowl inlet. The heater control is located in the instrument panel to the right of the steering column. It includes the function control knob, temperature control knob, and heater blower motor switch.

The heater blower housing assembly includes:
^ blower motor
^ heater blower motor switch resistor
^ A/C damper inlet door
^ vacuum control motor to operate A/C damper inlet door
^ electrical harness

The heater blower housing is installed on the engine compartment side of the dash panel. Electrical wire receptacles for the blower motor and heater blower motor switch resistor are provided on the heater plenum chamber case and a vacuum connection is provided on each vacuum control motor.

A heater air plenum chamber, on the passenger compartment side of the dash panel attaches to the heater plenum chamber case through the panel with an air passage between the assemblies provided through an opening in the panel.

The heater air plenum chamber includes the following components:
^ heater core
^ temperature blend door
^ floor/panel door
^ floor/defrost door
^ vacuum control motors and vacuum hose harness

The vacuum control motors and their vacuum lines operate the floor/defrost and floor/panel doors. The temperature blend door is operated mechanically by a A/C temperature cable attached to the temperature control knob in the heater control.

The function control knob is used to select the functional setting of the heater system. The settings are: VENT, FLOOR, OFF, MIX and DEFROST. Power is supplied to the blower motor when the function knob is in any position except OFF.