Blower Motor Resistor; Blower Motor Assembly - Chevrolet Light Duty Truck 1978 Service Manual

BLOW ER RESISTOR
y
Replacem ent
1. Disconnect the battery ground cable.
2. Disconnect the drain tube from the rear duct.
3. Remove the screws securing the duct to the roof
panel and rear header brackets.
4. Remove the duct.
5. To install, reverse Steps 1-4 above.
JU N CTIO N BLOCK
BLOW ER M OTOR
Fig. 1 B -3 9 --E n g in e C o m p a r t m e n t W ir in g Harness (C-K M o d e ls )
DISCHARGE PRESSURE
SW ITCH

BLOWER MOTOR RESISTOR

The blower motor resistor is located on the cover side
of the Four-Season System blower-evaporator as shown in
Figure IB-41.
Replacement
1. Disconnect battery ground cable.
2. Disconnect the electrical harness at the resistor.
3. Remove the resistor attaching screws and remove the
resistor.
4. To install a new resistor, reverse Steps 1-3 above.
BLOWER MOTOR ASSEM BLY
Removal (Fig. 1 B-42)
1. Disconnect the battery ground cable.
2. Remove the rear duct as outlined previously.
3. Disconnect the blower motor ground strap.
4. Disconnect the blower motor lead wire.
5. Remove the lower to upper blower-evaporator case
screws and lower the lower case and motor assembly.
Before removing the case screws,
CAUTION:
support the lower case to prevent damage to the
case or motor assemblies.
6. Remove the motor retaining strap and remove the
motor and wheels. Remove the wheels from the motor shaft.
Installation
1. Place the blower wheels onto the motor shaft making
sure the wheel tension springs are installed on hub of wheels.
Be sure that the blower wheels are
CAUTION:
installed as shown in Figure IB-43.
COM PRESSOR
LINE
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