Control Assembly: Description and Operation

Control Lever Assembly




The control lever assembly has some cables to control the mode and temperature of the heater unit and the mode door for the air source of the blower assembly.

The fan control is used to control the amount of air sent out by the resistor at four levels from "LOW" to "HIGH".

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.

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. Bi-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 a small amount of air to the windshield.

4. Def/Foot - In this position, air flow is delivered to the foot, while sending approx. 40% of total amount of air to the windshield.
Selecting this mode allows air conditioning system to work while the fan switch is turned to on position, even if the A/C switch is off.
Also the fresh air can be delivered even when the circ position is selected.

5. Defrost - In this position, most of the air is delivered to the windshield and a small amount is delivered to the side windows.
Selecting this mode allows air conditioning system to work while the fan switch is turned to on position, even if the A/C switch is off.
Also the fresh air can be delivered even when the circ position is selected.




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.

And even though the circ position is selected, the fresh air can be delivered while the DEF or DEF/FOOT position is selected.

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.