Pontiac FIREBIRD 1972 Service Manual page 54

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HEATING AND VENTILATION
Fig. 1-3 1 Heater Core and Case - X Series
Disconnect heater hoses at core connections (Fig.
1-30) and plug core tubes to prevent spilling coolant
when removing core and case assembly.
Remove retaining nuts from core case studs on the
engine side of the dash.
15. Connect heater hoses, being careful to install them in
their proper locations.
16. Refill radiator and connect battery.
HEATER CASE
REMOVE A N D REPLACE
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EXCEPT X SERIES
1. Perform steps 1 through 7 of heater core replacement
procedure.
2. Transfer parts to new heater case: temperature door
cam, heater outlet, cable brackets, blower resistor
and (on G Series) defroster and air diaphragms.
3. Install heater core. Be sure the core to case sealer is
intact before installing core. Use new sealer if neces-
sary.
4. Perform steps 9 through 13 of heater core replace-
ment procedure.
For installation refer to Figs. 1-25 (B Series), 1-21 (G
Series), 1-22 (A Series) and 1-32 (F Series).
Inside vehicle, remove glove compartment and door.
REMOVE A N D REPLACE
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X SERIES
From inside vehicle, drill out lower right hand heater
case stud with 1/4" drill.
Pull the entire heater core and case assembly (Fig.
1-3 1) from the firewall.
Disconnect heater cables and blower resistor connec-
tor from heater case and remove core and case assem-
bly from car.
Remove the core tube seal and core assembly retain-
ing strips and remove core.
Install replacement core. Be sure the core to case
sealer is intact before installing core. Use new sealer
if necessary.
Install core retaining strips and core tube seal.
Replace drilled out heater case stud with new screw
and stamped (pall) nut.
Inside car, insert heater case studs through holes in
cowl and blower and air inlet assembly. Install case
to firewall mounting nuts. (NOTE: It may be neces-
sary to first insert coolant tubes through the dash
followed by the studs.)
1. Perform steps 1 through 9 of heater core replacement
procedure.
2. Transfer parts to new heater case: cable brackets,
heater outlet and blower resistor.
3. Install heater core. Be sure core to case sealer is intact
before installing core. Use new sealer if necessary.
4. Perform steps 11 through 16 of heater core replace-
ment procedure.
LOWER VENT DOOR
REMOVE A N D REPLACE
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B SERIES
1. Remove vent cable retainer and disconnect cable
from door.
'
2. Remove retaining screw(s) and release vent grille
(Fig. 1-7) from plenum duct.
3. Slide vent door to one side to release pivot shaft and
remove door.
Connect heater cables and resistor connector. Check
cable operation and adjust if necessary.
4. To replace, reverse removal procedure.