Vacuum Components; Control Panel; Temperature Control; Blower Control - Pontiac FIREBIRD 1972 Service Manual

AUTOMATIC TEMPERATURE CONTROL 1 B-4 1
t
FRONT OF CAR
ENGINE
VACUUM SOURCE
PINK STRIPE
(UPPER HEAT SELECT)
DEFROSTER DOOR COMPARTMENT
BLACK (OR VENDOR CODED]
INLET
Fig. 1 6 - 4 0 ATC Vacuum Schematic
-
G Series
VACUUM COMPONENTS
Vacuum control of various air valves in the system is
achieved by using two rotary vacuum valves (Fig. 1B-40),
one located in the control panel and the other in the
programmer. Vacuum is supplied to the rotary valves
from the carburetor through a check valve. The two rotary
valves are linked by a vacuum hose harness which consists
of vacuum hoses connecting numbered spigots on the
valves.
CONTROL PANEL
The control panel (Fig. 1 B-41) uses three levers to dictate
system operation. The air control lever (system selector
lever) selects the mode of operation desired by the opera-
tor. In all but extreme conditions, the "Normal" mode
will be exclusively selected for maximum comfort. Control
panel settings for various conditions are listed in the own-
ers manual.
TEMPERATURE CONTROL
The temperature lever on the control panel regulates tem-
perature of the air distributed to the passenger compart-
ment to maintain the desired comfort level in the car.
Once set, control requires no change from day to day or
season to season except to satisfy changes in requirements
for personal comfort.
BLOWER CONTROL
The blower speed lever on the control panel permits selec-
tion of two ranges of air flow
-
High or Low. Air flow
varies automatically in either range due to demand placed
TEMPERATURE
\
SYSTEM SELECTOR
LEVER
Fig. 1 6 - 4 1 A T C Control Panel
-
G Series