Heating and Ventilation System

HEATING AND VENTILATION SYSTEM

General Description

Heater

When the engine is warming up, the warmed engine coolant is sent out into the heater core. The heater system supplies warm air into the passenger compartment to warm it up.

Outside air is circulated through the heater core of the heater unit and then back into the passenger compartment. By controlling the mixture of outside air and heater core air, the most comfortable passenger compartment temperature can be selected and maintained.

The temperature of warm air sent to the passenger compartment is controlled by the temperature control knob. This knob acts to open and close the air mix door, thus controlling the amount of air passed through the heater core.

The air selector knob, with its different modes, also allows you to select and maintain the most comfortable passenger compartment temperature.




The air source select lever is used to select either "FRESH" for the introduction of the outside air, or "CIRC" for the circulation of the inside air. When the lever is set to "FRESH", the outside air is always taken into the passenger compartment. When setting the lever to "CIRC" position, the circulation of air is restricted only to the inside air with no introduction of the outside air and the air in the passenger compartment gets warm quickly. However, the lever is normally set to "FRESH" to prevent the windshield from clouding.

Ventilation

Setting the air source select lever to "FRESH" position allows the heating system to work with sending the fresh air from outside.
The blower fan also serves to deliver fresh outside air to the passenger compartment to assure adequate ventilation.