GMC 1982 Light Duty Truck Service Manual page 86

HEATER CORE - G SERIES
R eplacem ent
1. Disconnect battery ground cable.
2. Remove engine cover as outlined in Section 6A of this
m anual.
3. Remove steering colum n to insrum ent panel attaching
bolts and lower column.
4. Remove upper and lower instrum ent panel attaching
Fig. 1 B-44--Recirculating Air Door Vacuum Actuator
Fig. 1 B-43--Heater Distributor Duct-G Series
5. Raise and support right side of instrum ent panel.
6. Remove right lower instrum ent panel support bracket.
7. Remove recirculating air door vacuum actuator. Refer
8. Disconnect tem perature cable and vacuum hoses at
9. Remove heater distributor duct, refer to Fig. 1 B-45.
10. Remove 2 defroster duct to dash panel attaching screws
11. W orking from the engine com p artm en t, disconnect
12. Remove three (3) nuts from bolts attaching heater core
case to dash panel and one (1) screw at lower right
corner (inside).
13. Remove distributor assembly from vehicle.
14. Remove gasket to expose screws attaching case sections
together as shown in Fig. 1B-46.
15. Remove tem perature cable support bracket.
16. Remove case attaching screws and separate case.
17. Remove heater core.
18. To install new heater core, reverse Steps 2 thru 17
above.
AIR CONDITIONING
screws and radio support bracket attaching screw.
to Fig. 1 B-44.
distributor case.
(below windshield).
heater hoses and plug to prevent w ater spillage.
IB-43