Chevrolet Light Duty Truck 1973 Service Manual page 103

2. Purge system of refrigerant.
3. Disconnect inlet and outlet refrigerant lines from
the back of unit. Cap or plug all open connections
at once.
4. Disconnect drain tubes from evaporator case.
5. Disconnect electrical connector from compressor.
Remove the terminal (See Figure 95) and allow
connector to hang on ground wire.
6. Remove screws securing grommet retainer to dash
panel. Remove wire from grommet through slit.
7. Disconnect electrical lead at connector.
8. Remove unit mounting bolts. Remove unit from
vehicle, carefully pulling compressor electrical lead
through dash panel.
Once the unit has been removed from the vehicle,
continue with component replacement as follows:
BLOWER ASSEMBLY
Removal (Fig. 96)
1. Remove the cover plate and separate the upper and
lower case halves. Remove blower motor mounting
strap screw and remove strap.
2. Remove blower assembly. Loosen the blower wheel
setscrews and remove the wheels from the motor
shaft.
Installation
1. Install the blower wheels on the motor so that the
lower blades curve toward the dash panel side of
the unit when the motor is placed in the case as
illustrated in Figure 96. Do not tighten setscrews at
this point.
2. Place the motor in the bracket with the electrical
connector side of the motor to the right side of the
bracket. Attach the mounting strap. Align blower
SCREW DRIVER
(NARROW BLADE)
A. Insert screw driver in groove & press
tang toward terminal to release.
B. Pry tang back out to insure locking
when reinstalled into connector._____
Fig. 95-Terminal Removal
TERMINAL
CONNECTOR
TANG
GROOVE
HEATER A N D AIR C O N D IT IO N IN G
Fig. 96--B!ower Assembly (Motor Home Chassis Unit)
wheels so that they do not contact case. Tighten
setscrews.
3. Assemble the case halves and attach the cover plate.
4. Reverse steps 1-8 on the "Blower-Evaporator
Assembly" removal procedure.
5. Evacuate, charge and check the system.
EXPANSION VALVE, EVAPORATOR AND/OR
EVAPORATOR CASE
Removal (Fig. 97)
1. Remove the cover plate and separate upper and
lower case halves.
2. Remove inlet and outlet lines from the expansion
valve. Remove sensing bulb from the evaporator
outlet manifold. Remove expansion valve. Cap or
plug open connections at once.
THERMOSTATIC SWITCH
CAPILLARY TUBE
BUMPER
Fig. 97-Expansion Valve (Motor Home Chassis Unit)
1A-77
CORRECT
BLOWER
BLADE
ANGLE
SCREEN
MESH
EXPANSION VALVE
LIGHT DUTY TRUCK SERVICE MANUAL