With Heater System
HEATER CONTROL ASSEMBLYHeater Control Assembly:
The control assembly is located in the instrument panel at the right of the steering column. The control assembly contains a four position blower knob a temperature control knob, a function control knob and illumination bulb.
The heater and power ventilation control includes a function control knob for PANEL, FLOOR, OFF, MIX and DEFROST that determines the manner in which the system will operate, a temperature control knob for manually setting the desired comfort temperature, and a blower switch to control the volume of air movement. Each position of the function control knob and blower switch is detented for positive engagement. The blower switch provides four manually selected blower speeds and may be operated in any position to select the desired amount of airflow.
The control assembly consists of three main parts:
1. The function selector - a vacuum selector valve combined with an internal electrical switch.
a. The vacuum selector valve directs source vacuum to various vacuum control motors.
Heater System Electrical Wiring Diagram:
b. One internal single-pole electrical switch is also controlled by the selector. The internal electrical switch controls the electrical supply to the heater blower motor switch.
2. The blower switch - an electrical switch that provides four speeds of heater blower motor operation manually set to select the desired airflow.
Electric Blend Door Actuator:
Temperature Adjustment Potentiometer:
3. The temperature control knob (temperature adjustment potentiometer) which connects through an A/C electronic door actuator motor to the A/C air temperature control door of the heater air plenum chamber assembly by an A/C electronic door actuator motor. Movement of the control knob from COOL to WARM causes a corresponding movement on the A/C air temperature control door and determines the temperature that the system will maintain.