Heating and Ventilation System
General DescriptionHeater
When the engine is warming up, the warmed engine coolant is sent 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 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 switch (Mode SW), with its different modes, also allows you to select and maintain the most comfortable passenger compartment temperature.
The air source select switch is used to select either "FRESH" for the introduction of the outside air, or "CIRC" for the circulation of the inside air. When the switch is set to "FRESH", the outside air is always taken into the passenger compartment. When setting the switch 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 switch is normally set to "FRESH" to prevent the windshield from clouding.