Heating and Ventilation System
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 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.
Control Lever Assembly
The vehicle has cable-control-type to control by cable the mode and temperature of the heater unit and the mode door for the air source of the blower assembly.
The tan control is used to control the amount of air sent out by the resistor at four levels from LOW to HIGH.
Ventilation
Set AIR SOURCE SELECT LEVER to FRESH position and turn on the blower fan. Heating can be done in this lever position, sending in fresh air from outside. The blower tan also serves to deliver fresh outside air to the vehicle interior to assure adequate ventilation.
Air Select Knob
The air select knob allows you to direct heated air into the passenger compartment through different outlets.
1. Vent - In this position, air is discharged from the upper air outlet. Air quantity is controlled by the fan control lever.
2. B1-Level - In this position, air flow is divided between the upper air outlets and the floor air outlets, with warmer air delivered to the floor outlets than the air delivered to the upper air outlets when the temp lever is in middle position.
3. Foot - In this position, air flow is delivered to the foot, while sending approx. A small amount of air to the wind shield.
4. Def/Foot - In this position, air flow is delivered to the toot, while sending approx. 40% of total amount of air to the windshield.
5. Defrost - In this position, most of the air is delivered to the windshield and a small amount is delivered to the side windows.
Moving the air source select lever to the CIRC position provides quickest heat delivery by closing the blower assembly mode door. In this position, outside air is not delivered to the passenger compartment.
Air Source Select Lever
The intake of outside air and the circulation of inside air are controlled by sliding this lever left or right.
Fan Control Lever
This lever controls the blower motor speed to regulate the amount of air delivered to the defrost, foot, and ventilation ducts:
1. Low
2. Medium Low
3. Medium High
4. High
Temperature Control Knob
When the temperature control knob is in the COLD position, the air mix door closes to block the flow air to the heater core.
When the temperature control knob is in the HOT position, the air mix door opens to allow air to pass through the heater core and heat the passenger compartment.
Placing the knob in a intermediate position will cause a lesser or greater amount air to reach the heater core. In this mode the passenger compartment temperature can be regulated.