Sable V6-183 3.0L DOHC VIN S MFI (1997)
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Two internal, single-pole electrical switches are also controlled by the A/C-heater function selector switch. The combination of these electrical
switches controls the electrical supply to the A/C clutch and heater blower motor switch.
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The position of the function selector knob determines the manner in which the system will operate.
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Each position of the function selector knob is detented for positive engagement.
Temperature Control
The temperature control operates in the following manner:
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Temperature control of the manual A/C-heater system is determined by the position of the temperature control knob (between COOL and
WARM).
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This control knob is connected to a potentiometer mounted in the integrated control panel. This potentiometer is electrically connected to the
A/C electronic blend door actuator that operates the A/C air temperature control door.
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The A/C electronic blend door actuator contains a reversible electric motor, another potentiometer and a printed circuit board. The wiper of the
potentiometer is connected to the actuator output shaft and moves with the output shaft to indicate the position of the A/C air temperature
control door.
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Battery voltage is applied to the ends of each potentiometer. The voltage available at each wiper indicates the position of the potentiometer.
The printed circuit board drives the actuator in whichever direction is necessary to make the actuator wiper voltage agree with the control
wiper voltage.
System uses a reheat method to provide conditioned air to passenger compartment.
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All airflow from the blower motor passes through the A/C evaporator housing where it can be cooled and dehumidified.
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Temperature is then regulated by reheating a portion of the cooled dry air and blending it with the remaining cool air to the desired
temperature.
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Temperature blending is varied by the A/C air temperature control door which regulates the amount of cooled air that flows through and
around the heater core, where it is mixed and distributed.
Blower Motor Control
Blower motor operation is controlled by the heater blower motor switch.
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The heater blower motor switch provides four manually-selected blower speeds and may be operated in any position to select the desired
amount of airflow.
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The heater blower motor switch and the heater blower motor switch resistor are positioned in the ground circuit of the blower motor.
With Electronic Automatic Temperature Control
These vehicles group together the following systems into a single integrated control panel:
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AM/FM stereo radio
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clock
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rear window defroster switch
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Electronic Automatic Temperature Control (EATC)
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full-logic cassette tape player
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compact disc player control (optional)
