On Vehicle Service; Blower Motor; Heater Distributor And Core Assembly - Chevrolet 1981 Light Duty Truck Service Manual

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 m ounting screws and
remove the m otor and wheel assembly. Pry gently on
the blower flange if the sealer acts as an adhesive.
4. Remove the blow er wheel to m otor sh aft nut and
separate the wheel and m otor assemblies.
5. To install a new m otor, 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.
b. If the motor m ounting flange sealer has hardened, or
is not intact, remove the old sealer and apply a new
L IG H T T R U C K SERVIC E M A N U A L

ON VEHICLE SERVICE

c. Check blower operations: blower wheel should rotate

HEATER DISTRIBUTOR AND CORE ASSEMBLY

C-K Models
Replacement (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 th e nuts from the d istrib u to r duct studs
projecting into the engine com partm ent.
4. Remove the glove box and door assembly.
5. D isconnect the A ir-D efrost and T e m p eratu 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 rearw ard 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 assem ­
bling unit.
G Models
Replacement (Fig. 1A-7)
1. Disconnect the battery ground cable.
2. Remove coolant recovery tank and lay aside.
3. Place a clean pan under the vehicle and then disconnect
th e heater core inlet and ou tlet hoses at the core
bead of sealer to the entire circum ference of the
m ounting flange,
freely with no interference.