The control assembly in the instrument panel contains the following components:

The controls are lit when the headlamps are on. Electrical power is provided by the control panel lighting circuit from the control panel harness.

The mode control switches allow the driver to control the direction and quantity of air through different outlets.

Brightness of the illumination is controlled by the instrument panel dimmer switch. The control assembly bulbs are in parallel with the radio bulb and the instrument cluster illumination bulbs.

Air quantity is controlled by the four-position blower fan control switch. The blower fan control switch provides a choice of various blower motor speeds.

When the temperature lever is in the COLD or extreme left end of the slot, all of the air delivered by the heater system is unheated. The temperature actuator and the temperature control door are positioned to stop all of the airflow through the heater cores so only unheated air is sent up in the heater module.

When the temperature lever is in the HOT or extreme right end of the slot, almost all of the air delivered by the system is heated. The temperature actuator and the temperature control door is positioned to open so that all of the airflow through the heater cores is sent up in the heater vent module.

Intermediate positions of the temperature lever result in a mixture of heated and unheated air to provide more moderate air temperatures. This lever operates the temperature actuator. As a result, this lever moves the temperature control door.

With the vent switch in the ON position, the inlet air actuator is activated. This causes the recirculating/fresh air door to open completely and air is discharged from the upper air outlets.

With the Bi-Level switch in the ON position, the mode actuator is activated. This causes the mode control door to open halfway. The airflow is divided between the upper air outlets and the floor air outlets.

With the Floor switch in the ON position, the mode actuator is activated. This causes the mode control door to open completely. The majority of airflow is routed to the floor while the remaining airflow is routed to the windshield outlets.

With the Floor/Defrost switch in the ON position, the mode actuator is activated. This causes the mode control door to open halfway. Half of the airflow is delivered to the floor while the other half is delivered to the windshield outlets.

With the Defrost switch in the ON position, the mode actuator is activated. This causes the mode control door to open completely. The majority of the airflow is routed to the windshield outlets while the remaining airflow is routed to the floor.

With the Max /Rec/ Rc switch in the ON position, the air inlet actuator is activated. This causes the air inlet door to close.This allows very little outside air from entering the vehicle. The air is then recirculated throughout the vehcle.

With the A/C switch in the ON Position, the air conditioning will operate.