Chevrolet 1980 Light Duty Truck Service Manual page 89

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 (Fig. IB-46) to expose screws
attaching case sections together.
15. Remove temperature cable support bracket.
16. Remove case attaching screws and separate case.
17. Remove heater core.
18. To install new heater core, reverse steps 2 through
17 above.
BLOWER MOTOR - G SERIES
Replacement
1. Disconnect battery ground cable.
- Remove the coolant recovery tank, and
G Series
power antenna as outlined in Sections 6 and 9.
2. Disconnect the blower motor lead wire.
3. Remove the five blower motor mounting screws and
remove the motor and wheel assembly. Pry gently on the
blower flange if the sealer acts as an adhesive.
4. Remove the blower wheel to motor shaft nut and
separate the wheel and motor assemblies.
5. To install a new motor, reverse Steps 1-4 above.
The following steps should be taken to assure proper
installation:
a. Assemble the blower wheel to the motor with the
open end of the wheel away from the blower motor.
Fig. 1 B-43--Heater D is trib u to r Duct-G Series
or is not intact, remove the old sealer and apply a new bead
of sealer to the entire circumference of the mounting flange.
AIR C O N D ITIO N IN G
b. If the motor mounting flange sealer has hardened,
Fig. 1 B -4 4 -R e c ircu la tin g A ir Door Vacuum A c tu a to r
1B-43
LIG H T T R U CK S ER V IC E MANUAL