General Information
FIGURE 1:
BLOWER CONTROL SLIDE
This control regulates the air flow into the passenger compartment by adjusting the speed of the blower motor, as long as the "OFF" control is not actuated.
The air flow is at its maximum when the control slide (a) is pushed all the way to the right (Position HI, Figure 1).
The air flow is at its minimum when the control slide (a) is pushed to the left without reducing the blower motor speed to zero (Position LO, Figure 1).
TEMPERATURE CONTROL SLIDE
This control regulates the temperature of the air flowing into the passenger compartment by means of the air blend motor, as long as the "OFF" control is not actuated.
When the "AC MAX" "AC NORM" and "AC BI-LEVEL" controls are actuated, the air is first cooled and dried through the evaporator; then passes through or around the heater core to control discharge air temperature.
When control slide (b) is pushed all the way to the left, the air is not heated; it is at the lowest possible temperature (Figure 1).
The air temperature can be adjusted by moving control slide (b) to the right (Figure 1).
AIR CONDITIONING AND VENTILATION CONTROL PUSH BUTTONS (C) (Figure 1)
OFF
In this position, the air conditioning and ventilation system is completely shut off. Controls (a) and (b) are not operational (Figure 1). The air recirculation door is in the recirculation position.
AC MAX
In this position, the air conditioning system is actuated; the air recirculation door is in the recirculation position and the air distribution doors direct air to the instrument panel center and side air outlets.
This is the only position that will allow the highest speed of the blower motor in order to increase air conditioning efficiency when control slide (a) is pushed all the way to the right (Figure 1).
AC NORM
In this position, the air conditioning system is actuated; the air recirculation door is in the outside air position and the air distribution doors direct air to the instrument panel center and to the side air outlets.
AC BI-LEVEL
In this position, the air conditioning system is actuated; the air recirculation door is in the outside air position and the air distribution doors direct air to the instrument panel center and side air outlets and to the front and rear floor.
ECON VENT
In this position, the air conditioning system is not operational; the air recirculation door is in the outside air position and the air distribution doors direct air to the instrument panel center and side air outlets.
ECON HEAT
In this position, the air conditioning system is not operational; the air recirculation door is in the outside air position and the air distribution doors direct air to the front and rear floor and to the defogger outlets at the base of the windshield. Discharge temperature can be regulated with the temperature lever in this mode.
DEFOGGER
In this position, the air conditioning system is not operational; the air recirculation door is in the outside air position and the air distribution doors direct air to the windshield defogger outlets, while a slight air flow is directed to the instrument panel center and side air outlets.
IMPORTANT -- When the ignition is turned off, the last position used is memorized and restored after a 2-second delay when the ignition is turned on again.
If the battery has been disconnected, wait at least 15 seconds after reconnecting it before using the control keyboard. This will to allow time for the system reinitialization. When the battery is reconnected, the system will be in the defrost mode.
FIGURE 2:
AIR BLEND DOOR
The air blend door is operated by an electric motor (A) (Figure 2) equipped with a position-control potentiometer.
Current is supplied to the motor by the A/C control. The motor can be moved in either direction. The potentiometer provides the controller with information on its position.
If the motor is removed or replaced, always check that the reference marks on the pinions are properly aligned.
To reverse the direction of rotation, the polarities of the A1 and A3 terminals of the motor are reversed.
FIGURE 3:
AIR RECIRCULATION DOOR
The air recirculation door is controlled by an electric motor (B) (Figure 3). It is not position-timed with respect to the motor.
12 volts are supplied to the motor for 15 seconds every time the air blend door is moved (this is the time it takes for the blend door to go from one stop to the other).
To reverse the direction of rotation, the polarities of the A1 and A3 terminals of the motor are reversed.
FIGURE 4:
AIR DISTRIBUTION DOORS
The air distribution doors are controlled by an electric motor (G) (Figure 4).
The motor is not position-timed with respect to the air distribution doors. At each reinitialization of the system, it identifies its position by means of a built-in pulse contactor (measurement made between the air distribution door stops).
To reverse the direction of rotation, the polarities of the motor terminals are reversed.
FIGURE 5:
HEATER A/C BLOWER MOTOR
The fan control slide actuates the blower motor control module (F). The speed is changed by varying the voltage applied to the blower motor (11) (Figure 5).
The motor is protected by a thermo-circuit breaker. The motor power supply is cut off whenever the temperature reaches 320~F (160~C).
In all modes except A/C MAX the blower motor is supplied with between 3.5 and 10.7 volts to control air flow. In A/C MAX, the module will allow up to 12 volts to provide additional air flow.