1A-2 HEATING AND VENTILATION
GENERAL DESCRIPTION
Heater
When the engine 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 lever. This
lever acts to open and close the air mix door, thus controlling the amount of air passed through the heater core.
The air select lever, 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 com-
partment.
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 quickened. However, the lever is normally set
to “FRESH” to prevent the windshield from clouding.
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