Pontiac FIREBIRD 1972 Service Manual page 241

1B-54 1972 PONTIAC SERVICE MANUAL
2. Remove glove compartment.
3. Loosen screw and remove programmer link from
programmer output shaft (Fig. 1B-42).
4. Disconnect vacuum connector and electrical connec-
tor from programmer.
5. Remove programmer assembly toward rear of car to
avoid damaging blower motor resistor.
6. To replace, reverse removal procedure. Adjust tem-
perature door link.
PROGRAMMER COMPONENTS
-
REMOVE AND
REPLACE
VACUUM VALVE
Identify vacuum hoses connected to the two out-
board side ports of the vacuum valve and the port to
which each is connected. Disconnect the two vacuum
hoses.
Disconnect vacuum hose to center port on valve at
the transducer.
Remove two vacuum valve retaining studs and
remove valve. Lift valve drive arm off of vacuum
motor mechanism boss when removing valve.
To replace, reverse removal procedure. Make certain
vacuum valve spring is in place. Refer to Figs. 1B-54
and 1B-55.
t
Fig. 18-54 Internal View
-
Programmer
Fig. 18-55 Vacuum Valve and Checking Relay
CHECKING RELAY
1. Disconnect two vacuum hoses from vacuum valve at
the relay. Identify hoses and relay ports to which they
connect for reconnecting.
2. Disconnect long vacuum hose at other side of relay
and short vacuum hose at the vacuum motor and
remove relay.
3. To replace, reverse removal procedure. See Figs. 1B-
54 and 1B-55.
NOTE: If long vacuum hose (firm checking
relay to transducer) is replaced, the replace-
ment hose must be at Ieast IS" in length.
TRANSDUCER
1. Disconnect two vacuum hoses at transducer; identify
hoses and ports for reconnection.
2. Disconnect and identify two electrical terminals to
transducer.
Fig. 18-56 Vacuum Transducer Removed