GMC 1982 Light Duty Truck Service Manual page 33

1A-8 HEATER
BLOWER M O T O R
Rem oval (Fig. 1A-5)
1. Disconnect battery ground cable.
G Models - Remove the coolant recovery tank, and
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.
O N VEHICLE SERVICE
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
b. If the motor mounting flange sealer has hardened, or
c. Check blower operations: blower wheel should rotate
HEATER DISTRIBUTOR A N D CORE ASSEMBLY
C-K M odels
R eplacem ent (Fig. 1A -6)
1. Disconnect the battery ground cable.
2. Disconnect the heater hoses at the core tubes and drain
engine coolant into a clean pan. Plug the core tubes to
prevent coolant spillage at removal.
3. Remove the nuts from the d istrib u to r duct studs
projecting into the engine compartment.
4. Remove the glove box and door assembly.
5. Disconnect the Air-D efrost and T e m p e ra tu re door
cables.
6. Remove the floor outlet and remove the defroster duct
to heater distributor duct screw.
7. Remove the heater distributor to dash panel screws.
Pull the assembly rearward to gain access to wiring
harness and disconnect all harnesses attached to the
unit.
8. Remove the heater-distributor from the vehicle.
9. Remove the core retaining straps and remove the core.
10. To install, reverse Steps 1-9 above. Be sure core to case
and case to dash panel sealer is intact before
assembling unit.
G M odels
R eplacem ent (Fig. 1A-7)
1. Disconnect the battery ground cable.
2. Remove coolant recovery tank and lay aside.
installation:
a. Assemble the blower wheel to the motor with the
open end of the wheel away from the blower motor.
is not intact, remove the old sealer and apply a new
bead of sealer to the entire circumference of the
mounting flange.
freely with no interference.