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HEATER AND AIR CONDITIONING 1A-18
HIGH BLOWER
i DELAY RELAY
AMBIENT-SUN
SENSOR AND
COMPRESSOR SWITCH
Fig. 29—Comfortron Engine Compartment Components
COMFORTRON SYSTEM
The Chevrolet Comfortron Air Conditioning System is
basically the same as the Chevrolet Four-Season system
but with the additional feature of completely automatic
control. See Figures 28, 29 and 30 for views of the
Comfortron system. To the customer, the most notice-
able difference between the two systems, will be in the
control panel. In place of the three-lever/one-switch
panel of the Four-Season system, the Comfortron has a
single control lever plus a temperature dial similar to
that found in a home thermostat. After the dial is set to
the desired temperature indication and the lever is moved
to place the system in operation, the Comfortron will
automatically control the heating and air conditioning
functions to maintain the selected interior temperature
regardless of changes in outside air temperatures.
Most Comfortron parts are located in the passenger
compartment, (fig. 28)
Jn-Car Sensor
The function of the in-car sensor is to determine the
temperature of the interior of the automobile. It is
located beneath the overhang of the instrument panel.
Feedback Potentiometer
The feedback potentiometer indicates to the amplifier
system the position of the temperature door.
Control Head
A thumb wheel is provided to select the desired in-car
temperature. A control lever performs the following
functions:
1. Operates a switch that allows the customer to select
the type of blower program desired.
2. Operates the control head vacuum switch except
when the TEMPERATURE lever is in the OFF
position, thus programming the vacuum system.
3. Operates the defroster through the control head
vacuum switch.
The defroster door is partially
opened in the "DE FOG" position, and fully open in
the "DE ICE" position.
A two transistor amplifier is located on the bottom
side of the control head. It receives information from
the sensors, and in turn operates the transducer.
Fig. 30—Comfortron Control
CHEVROLET CHASSIS SERVICE MANUAL
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