Chevrolet 10 1971 Series Chassis Service Manual page 57

2. Install the switch electrical connections as noted in
Figure 55. If the thermostatic switch was removed,
be sure to install the sensing capillary in the bracket
as shown in Figure 57.
3. Reverse Steps 1-7 of the "Removal" procedures, be­
ing careful not to pinch or otherwise damage the
capillary when installing the duct and cover assem­
blies.
EVAPORATOR CORE, EXPAN SIO N VALVE,
BLOWER M OTO R A N D WHEELS
To gain access to these components, it is necessary to
disconnect the refrigerant lines and remove the entire
blower-evaporator unit from the vehicle.
Removal
1. Disconnect the battery ground cable.
2. Purge the system of refrigerant.
3. Remove the glove box and door assemblies.
4. Remove the dash and kick panel attachments.
5. Disconnect the drain tubes at the case.
6. Disconnect the refrigerant lines at the top of the
case. Cap or tape the open connections at once.
7. Lower the entire unit to the floor, being careful not
to damage the wiring harness.
8. Remove the duct rear cover screws and then with a
small screwdriver, carefully unclip the cover.
9. Disconnect the blower motor lead wire. Disconnect
the wiring harness from the switches and remove the
entire blower-evaporator unit from the vehicle.
10. Blower Motor and Wheels (Fig. 58)—Disconnect the
blower ground wire.
case screws and separate the case halves. Remove
the motor clamp screw and remove the clamp.
Loosen the blower wheel set screws and remove the
wheels from the motor shaft.
Expansion Valve (Fig. 58)—Remove the evaporator
core outlet line cover.
capillary bulb clamps.
clamp screw. Disconnect the valve inlet and outlet
lines and remove the expansion valve.
the open connections at once.
AIR DUCT
THERMO
CAPILLARY INSTALLED
IN BRACKET
Fig. 5 7 — Thermostatic Switch C a p illa ry Retaining Bracket
Remove the lower to upper
Remove the expansion valve
Remove the expansion valve
Cap or tape
THERMOSTATIC
SWITCH
BLOWER
SWITCH
HEATER AND AIR CONDITIONING 1A-39
Fig. 58— Blower Motor Installation
Evaporator Core (Fig. 58)—Remove the evaporator
core outlet line cover.
capillary bulb clamps.
to core screws, core outlet line clamp screw and
expansion valve inlet line clamp screw. Remove the
upper case from the core and expansion valve.
Disconnect core at the inlet and outlet line connec­
tions and separate the core and expansion valve. Cap
or tape the open connections at once.
Installation
1. Blower Motor and Wheels—Install the blower wheels
onto the motor shaft as shown in Figure 58. Install
motor and wheels into the lower half of case, placing
the foam rubber mounting strip around the motor.
Install the motor clamp and install the screw. Ro­
tate the blower wheels and determine if interference
exists. Interference can be corrected by moving the
motor slightly in its mount or by changing the wheel
location on the motor shaft.
to the upper case and connect the motor ground wire.
EXPANSIO N
VALVE
EXPANSIO N
CAPILLARY
VALVE
Fig. 5 9 — Evaporate Core and Expansion V a lv e Location
Remove the expansion valve
Remove the (4) upper case
Install the lower case
EVAPORATOR
10-30 CHEVROLET TRUCK SERVICE MANUAL