Chevrolet Light Duty Truck 1973 Service Manual page 91

the Four-Season System blower-evaporator as shown in
Figure 71.
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 ASSEMBLY
Removal
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.
Fig. 71-Overhead System
Front Wiring (C-K Models)
Installation
2. Install the blower motor retaining strap and foam.
3. Place the blower motor and wheel assembly into the
HEATER A N D AIR C O N D IT IO N IN G
1. Place the blower wheels onto the motor shaft and
install the setscrews; do not tighten the setscrews at
this time.
Be sure that the blower wheels are
CAUTION:
installed as shown in Figure 73.
lower case. Align the blower wheels so that they do
1A-65
LIGHT DUTY TRUCK SERVICE MANUAL