Pontiac FIREBIRD 1972 Service Manual page 203

1B-16 1972 PONTIAC SERVICE MANUAL
FRONT
OF
CAR
ENGINE
IUPPER HEAT SELECT)
COMPARTMENT
UPPER & LOWER SLAVE DOORS
INLET
Fig. 18-1 3 ATC Vacuum Schematic
-
G Series
Diagram (Fig. 1 B- 12), ATC Vacuum Schematic (Fig. 1B-
13) and ATC Vacuum Valve Positions (Figs. 1B-14 and
1B-15).
Until one becomes familiar with the system, the entire
diagnosis procedure will probably be most helpful. If an
individual component is suspected, the following table will
be of help. It lists the tests as well as the components
which are checked by each test found in the diagnosis
guide.
TEST CHECKS SYSTEM FOR
A Master Switch
Master Relay
B Fuse from alternator
Programmer
Master Relay
C Control Panel Vacuum Valve
Air Inlet Door Dual Diaphragm
D Fuses
Master Relay
Resistor Block
Blower Range Switch
Blower Motor
Programmer
Water Control Valve
Temperature Door Adjustment
Control Panel Vacuum Valve
Vacuum Supply Hose
Programmer Vacuum Valve
Diverter Door Operation
Programmer Vacuum Valve
Hi Blower Relay
Blower Range Switch
Programmer
Compressor Clutch
Ambient Switch
Sensor String
Temperature Door Adjustment
Programmer
Diverter Door Diaphragm
Defroster Door Diaphragm
Vacuum Hose
Control Panel Vacuum Valve
De-Ice Switch
Programmer
(Same as Test H with system in DEFROST)
Dual Diaphragm Air Inlet Door
Control Panel Vacuum Valve
Programmer Vacuum Valve
Bi Level Boost Switch
Single Diaphragm
-
Air Inlet Door
Control Panel Vacuum Valve