Chevrolet 1977 light duty truck, Service Manual

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ON VEHICLE SERVICE
BLOW ER M O T O R
Rem oval (Fig. 1A-7)
1. Disconnect battery g round cable.
G Models - Remove the battery.
2. Disconnect the blower m otor lead wire.
3. Remove the five blower m otor m ounting screws
and remove the m otor an d wheel assembly. Pry gently
on the blower flange if the sealer acts as an adhesive.
4. Remove the blower wheel to m otor shaft nut
a n d separate the wheel and m otor assemblies.
5. To install a new motor, reverse Steps 1-4 above.
N O T E : The following precautions should be taken
to assure p ro p er installation:
a. Assemble the blower wheel to the motor with
the o p en end o f the wheel away from the blower motor.
b. If the m otor m ounting flange sealer has
hardened, or is not intact, remove the old sealer and
apply a new bead o f sealer to the entire circumference o f
the m ounting flange.
c. Check blower operations: blower wheel should
rotate freely with no interference.
HEATER D IS T R IB U T O R A N D CORE
ASSEMBLY
C-K M odels
Replacement (Fig. 1A-8)
1. Disconnect the battery ground cable.
2. Disconnect the heater hoses at the core tubes
and d ra in engine coolant into a clean pan. Plug the core
tubes to prevent coolant spillage at removal.
3. Remove the nuts from the distributor duct studs
projecting into the engine com partm ent.
4. Remove the glove box and door assembly.
5. Disconnect the Air-D efrost and T em perature
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 rearw ard to gain access to
w iring 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.
Fig. lA -7 - Blower M otor Assem bly Fig. lA-8--H eater D is trib u to r A ssem bly-C K Models