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HEATER AND AIR CONDITIONING 1A-17
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Fig. 28—Comfortron Underdash Components
lever is above and slightly left of the COLD position, the
compressor is on, the air selector door is in the re-
circulation position, the temperature door is in the fully
cold position, and the blower is operating. Moving the
lever slightly to the right of COLD moves the air selector
door to the full outside air position while temperature
door, compressor, and blower functions remain the same
as in the "recirculating - COLD" system operation.
Moving the TEMPERATURE lever further to the right
moves the temperature door which channels some air
through the heater core. At a point about midway between
COLD and HOT, the compressor clutch switch opens and
the system is operating as a heater only with untreated
outside air (passing through the inoperative evaporator
core) mixing with heated outside air. With the lever in
the HOT position, all air (outside air) passes through the
heater core for full heat output.
Outlets and Defroster Levers
While the TEMPERATURE lever is in any operating
position, the OUTLETS and DEFROSTER levers may be
operated as desired. The OUTLETS lever directs the air
to either the heater outlet, both heater and dash outlets,
or to the dash outlets only. The DEFROSTER lever
directs air (which is flowing to the heater outlet) up to
the defroster outlets. With the DEFROSTER lever, in
the OFF position, a fixed bleed permits a small quantity
of air to flow to the defroster outlets while the major
volume of air flows from the heater floor distributor.
In the DEFROST position, airflow is split between the
heater and defroster outlets. In the DE ICE position, all
air is diverted to the defroster outlets. Since the air
must be in the heater duct in order to be directed by the
defroster door, the OUTLETS lever must be in LOWER
position which causes air to flow out the lower outlets,
if the OUTLETS lever is in the UPPER position, de-
froster door movement will have no effect on the system.
Fan Switch
The fan switch controls the operation of the three
speed blower motor except when the TEMPERATURE
lever is in the OFF position.
Four-Season System (Chevelle)
Full control of the Chevelle Four-Season is obtained
through the use of a single control panel (fig. 27) much
the same as that previously described for the Chevrolet
Four Season System. The Chevelle control differs in
operation only in that AIR and TEMPERATURE are sep-
arate controls rather than a combination control as in the
Chevrolet control panel. Except for this difference,
operation of the levers is similar to the Chevrolet
controls.
CHEVROLET CHASSIS SERVICE MANUAL
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