Blower A Ss E M B; Thermostatic An D/Or Blower Switches - GMC 1982 Light Duty Truck Service Manual

IB-52 AIR CONDITIONING
panel. Remove wire from grom m et through slit.
7. Disconnect electrical lead at connector.
8. Rem ove u n it m ounting bolts. Rem ove unit from
vehicle, c arefu lly pulling com pressor electrical lead
through dash panel.
O nce the unit has been removed from the vehicle,
continue with com ponent replacem ent as follows:
BLOWER ASSEMBLY
Rem oval (Fig. IB -7 1 )
1. Remove the cover plate and separate the upper and
lower case halves. Remove blower m otor m ounting
strap screw and remove strap.
2. Remove blower assem bly. Remove the wheels from the
m otor shaft.
Installation
1. Install the blower wheels on the motor so th a t the lower
blades curve tow ard the dash panel side of the unit
when the motor is placed in the case as shown in Fig.
IB-85.
2. Place th e m otor in th e b rack et w ith the electrical
connector side of the m otor to the right side of the
b ra c k e t. A tta ch the m o u n tin g strap . A lign blow er
wheels so th a t they do not contact case.
3. Assem ble the case halves and attach the cover plate.
4. R everse S teps 1-8
A ssem bly" removal procedure.
5. Evacuate, charge and check the system.
SCREW DRIVER
(NARROW BLADE)
j ____\
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. 1 B-70--Terminal Removal
on th e " B low er-E vaporator
TERMINAL
/
/
CONNECTOR
tang
\
GROOVE
Fig. 1B-71--Blower Assembly (Motor Home Chassis Unit)
E X P A N S IO N VA LV E , EVAPO RATO R A N D /O R
EVAPORATOR CASE
Rem oval (Fig. IB -7 2 )
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 o utlet
manifold. Remove expansion valve. C ap or plug open
connections at once.
3. Remove evaporator core retaining screws and remove
core.
4. Remove blower motor and harness assembly from case.
Installation
1. Reverse applicable steps in the removal procedure.
NOTICE: Use new " O " rings coated w ith clean
refrigeration oil when connecting lines. Add 3 oz. of
new refrigeration oil to a new core.
2. Reverse steps 1 thru 8 of the "Blower Evaporator
A ssem bly" removal procedure.
3. Evacuate, charge and check the system.
THERM OSTATIC A N D /O R BLOWER SWITCHES
R eplacem ent
1. Remove the cover plate assembly from the evaporator
case.
2. Remove two screws securing either switch to the cover
plate and remove appropriate switch (Fig. 1B-73).
THERMOSTATIC SWITCH
CAPILLARY TUBE
BUMPER
Fig. 1 B-72--Expansion Valve (Motor Home Chassis Unit)
SCREEN
MESH
EXPANSION VALVE