Pontiac FIREBIRD 1972 Service Manual page 102

CUSTOM AIR CONDITIONING 1A-43
A SERIES
F SERIES
A-SYSTEM SELECTOR L E V E R
&TEMPERATURE L E V E R
C-FAN SWITCH
D-COMPRESSOR CLUTCH
(VENT-NORM) SWITCH
Fig.
1 A - 4 1 A/C Control Panels
-
A, G and F Series
AIR CONTROL LEVER
The system selector lever (air control lever) determines
the mode of operation desired of the system:
OFF-In the OFF position, the entire system is turned off.
The blower motor will operate on F Series to achieve
evaporator core purging.
INSIDE-Passenger compartment air is recirculated,
blended with a small amount of outside air and then con-
ditioned before returning to the air outlets.
A/C-In the air conditioning (A/C) position, fresh outside
air is conditioned and directed out the five (5) upper air
outlets.
BILEVEL-The BILEVEL position provides fresh condi-
tioned outside air through the five upper air outlets men-
tioned above, as well as the lower heater outlet. Air from
the upper outlets is slightly cooler than air from the lower
outlets. This provides excellent ventilation on cool sunny
days.
HEAT-In the HEAT position, fresh outside air is condi-
tioned and directed out the lower heater duct. A small
amount of air is also directed to the windshield. This
provides clear vision under normal operating conditions.
DEFROST-The DEFROST position directs maximum
air flow to the windshield. This quickly clears the wind-
shield of fog or frost.
WARNING: Operate the A or G Series system in
heater or air conditioning mode for 30 seconds
I
before switching to DEFROST. This will remove
humid air from the system and reduce possible
,
rapid formation of fog or frost on the insideof the
windshield during initial operation under certain
atmospheric conditions. In addition, clear any
I
snow or ice from cowl air vents (at outside base
I
of windshield).
TEMPERATURE CONTROL LEVER
The temperature control lever regulates the temperature
of air entering the passenger compartment. The lever may
be set at full COOL, full WARM, or any point between
the two.
FAN SWITCH
The fan speed lever (blower speed switch) controls the
speed of the blower motor in delivering air to the passen-
ger compartment. The blower speed switch provides low
and high speeds of the blower motor plus two intermediate
speeds.
NORM-VENT LEVER
The Vent-Normal switch serves as an ON-OFF switch for
t'he compressor. If conditioned air is desired, the NORM
position should be used. Whenever the system is changed
from one mode to another, the Vent-Normal switch will
automatically be in the normal position. Moving the lever
to the VENT position will eliminate conditioning of the
air, turn the compressor off and supply outside air directly
to the passenger compartment.