Chevrolet Light Duty Truck 1973 Service Manual page 85

3. Disconnect the accumulator inlet and outlet lines
and cap or plug the open connections at once.
4. Remove the outlet line clamp screw and the
accumulator clamp screw and remove the unit from
the vehicle.
5. If a new accumulator is being installed, add 1 fluid
ounce of clean refrigeration oil to the new
accumulator.
6. Install the new unit following Steps 1-4 in reverse
order. Connect all lines using new "O " rings, coated
with clean refrigeration oil.
Do not uncap the new unit until
CAUTION:
ready to fasten the inlet and outlet line to the
unit.
7. Evacuate charge and check the system.
BLOWER ASSEMBLY
Replacement
1. Disconnect the battery ground cable.
2. Disconnect the blower motor lead and ground
wires.
3. Disconnect the blower motor cooling tube.
4. Remove the blower to case attaching screws and
remove the blower assembly. Pry the blower flange
away from the case carefully if the sealer acts as an
adhesive.
5. Remove the nut attaching the blower wheel to the
motor shaft and separate the assemblies.
6. To install, reverse Steps 1-5 above; replace sealer as
necessary.
EVAPORATOR CORE
Replacement (Fig. 59)
1. Disconnect the battery ground cable.
HEATER A ND AIR C O N D IT IO N IN G
2. Purge the system of refrigerant.
3. Remove the nuts from the selector duct studs
projecting through the dash panel.
4. Remove the cover to dash and cover to case screws
and remove the evaporator case cover.
5. Disconnect the evaporator core inlet and outlet
lines and cap or plug all open connections at once.
6. Remove the thermostatic switch and the expansion
tube assemblies.
7. Remove the evaporator core assembly.
8. To install, reverse Steps 1-7 above. Add three
ounces of clean refrigeration oil to a new
evaporator core.
Be sure to install the thermostatic
CAUTION:
switch capillary in the hole provided in the new
core.
NOTE: Use new "O " rings, coated with clean
refrigeration oil, when connecting refrigerant
lines.
Be sure cover to case and dash panel sealer is
intact before reinstalling cover.
9. Evacuate, charge and check the system.
EXPANSION TUBE
The expansion tube is located in the evaporator core
inlet line.
Replacement (Fig. 60)
1. Purge the system of refrigerant.
2. Disconnect the condenser to evaporator line at the
evaporator inlet. Cap the open line at once.
Fig. 60 -Expansion Tube (C-K Four-Season System)
1A-59
LIGHT DUTY TRUCK SERVICE MANUAL