Control Assembly, HVAC

Climate Control Assembly












The illustration shows the heater control used on Ranger and Explorer vehicles equipped with a heater-ventilation climate control system.

The heater control is installed in a rectangular cutout in the lower center area of the instrument panel. It contains three rotary switches. The extreme left switch is the heater blower motor switch.


Airflow Control

The function selector knob is located on the extreme right of the heater control. The knob rotates to positions: PANEL, OFF, PNL/FLR, FLOOR, FLR/DEF and DEFROST. In the OFF position, the recirculation door is closed to stop outside air from passing through the climate control system and to keep the in-vehicle air circulating. To shut off the blower motor, the function selector knob must be turned to the OFF position.



Temperature Control









The temperature selector actuates a variable resistance switch. This switch varies the voltage to an electric actuator used to position the temperature blend door.

Positioning the temperature control in any position between COOL and WARM causes the temperature blend door to direct more or less outside air through or around the heater core for whatever proportion of heated or unheated outside air is desired.

The air blends together as it leaves the heater core and enters the heater air plenum chamber for distribution.