Chevrolet 1980 Light Duty Truck Service Manual page 36

1A-8 HEATER
BLOWER MOTOR
Removal (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.
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. 1A-5--Blower M otor A ssem bly
ON VEHICLE SERVICE
or 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.
HEATER DISTRIBUTOR AND CORE
ASSEMBLY
C-K Models
Replacement (Fig. 1A-6)
drain engine coolant into a clean pan. Plug the core tubes
to prevent coolant spillage at removal.
projecting into the engine compartment.
cables.
duct to heater distributor duct screw.
Pull the assembly rearward to gain access to wiring harness
and disconnect all harnesses attached to the unit.
core.
case and case to dash panel sealer is intact before assembling
unit.
b. If the motor mounting flange sealer has hardened,
c. Check blower operations: blower wheel should rotate
1. Disconnect the battery ground cable.
2. Disconnect the heater hoses at the core tubes and
3. Remove the nuts from the distributor duct studs
4. Remove the glove box and door assembly.
5. Disconnect the Air-Defrost and Temperature door
6. Remove the floor outlet and remove the defroster
7. Remove the heater distributor to dash panel screws.
8. Remove the heater-distributor from the vehicle.
9. Remove the core retaining straps and remove the
10. To install, reverse Steps 1-9 above. Be sure core to
LIG H T T R U CK S E R V IC E M AN UAL