Chevrolet Light Duty Truck 1973 Service Manual page 87

8. To reinstall, reverse Steps 1-6 above. Check control
operation.
MASTER SWITCH AND/OR BLOWER
SWITCH
The master switch is located on top of the control
assembly.
Replacement
1. Disconnect the battery ground cable.
2. Remove the instrument panel bezel.
3. Remove the control to instrument panel screws and
allow control to rest on top of the radio.
4. Remove the switch to control screws, disconnect the
electrical harness at the switch and remove the
switch assembly.
5. To install a new switch, reverse Steps 1-4 above.
VACUUM TANK
The vacuum tank is mounted to the engine side of the
dash panel above the blower assembly (fig. 65).
Fig. 62 -Air Selector and Ducts (C-K Models)
Replacement
1. Disconnect the vacuum lines at the tank.
2. Remove the tank to dash panel screws and remove
3. To install, reverse Steps 1 and 2 above.
BLOWER MOTOR RESISTOR
The blower motor resistor is located in the blower side of
the blower-evaporator case (fig. 66).
Replacement
1. Disconnect the wiring harness at the resistor.
2. Remove the resistor to case attaching screws and
3. Place the new resistor in position and install the
4. Connect the resistor wiring harness.
HEATER A N D AIR C O N D IT IO N IN G
the tank.
remove the resistor.
attaching screws.
1A-61
LIGHT DUTY TRUCK SERVICE MANUAL