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HEATER AND AIR CONDITIONING 1A-16
EVAPORATOR
CORE
\
BLOWER AND AIR
I
INLET ASSEMBLY
•
AIR
DOOR
OUTSIDE AIR FROM COWL VENT
DEFROSTER
DUCT
DEFROSTER
DOOR
COOLED AIR
OUTLETS
Fig. 25—Airflow—Four-Season (Cheyelie)
will be hot at all times. When, during cooling operations,
the air is cooled by the evaporator to below comfort
level, it is then warmed by the heater to the desired
temperature; during "heating only" operations the evap-
orator will not be in operation and ambient air will be
warmed to the desired level in the same manner. The
side dash outlets may be rotated to provide either soft,
diffused airflow or spot cooling. Rotate half way to shut
off airflow. The barrel type outlet in the center of the
dash will direct air up or down or, if desired, shut it off.
Controls
Four-Season System (Chevrolet, Camaro)
Full control of the Four-Season System is obtained
through the use of a single control panel (fig. 26). The
control knobs make use of bowden cables to activate the
various doors and switches necessary for system opera-
tion. Therefore, control adjustment is a matter of
properly setting these bowden cables. The following
paragraphs explain each control.
Temperature Lever
The TEMPERATURE lever controls temperature door
position, compressor operation, and air selector door
position. When the lever is in the OFF position, the sys-
tem is totally inoperative; airflow is shut off, the fan
switch will not operate the blower, and the compressor
is off. In the VENT position, the air selector door is in
the "outside air" position and the blower is powered at
low speed. At any lever position other than OFF, the
blower will be powered at low, however, blower speed
may be increased by moving the FAN switch. When the
Fig. 26—Chevrolet Four-Season Controls
Fig. 27—CheveNe Four-Season Controls
CHEVROLET CHASSIS SERVICE MANUAL
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