Chevrolet Light Duty Truck 1973 Service Manual page 81

sure that all of the failed portion is removed. If
only a very small portion of the hose was removed,
it may be possible to splice the two ends together
using a special hose connector and two hose clamps.
If several inches of hose must be removed, a new
piece of hose should be spliced in using two
connectors and four hose clamps. Dip the ends of
the hoses in clean refrigeration oil before installing
the hoses onto the connector. Never push the end of
the hose beyond the locating bead of the connector.
Torque the clamp to 35-42 in. lbs.
NOTE: Be sure to replace the hose in the
body in the same m anner as when removed.
If the hose protective grommets are badly
mutilated, they should be replaced.
4. Evacuate, charge and check the system.
COMPRESSOR
C-K Models
Removal (Fig. 56)
1. Purge the refrigerant from the system.
2. Remove connector attaching bolt and connector.
Seal connector outlets.
3. Disconnect electrical lead to clutch actuating coil.
4. Loosen brace and pivot bolts and detach belt.
5. Remove the nuts and bolts attaching the compres­
sor brackets to the mounting bracket.
6. Before beginning any compressor disassembly,
drain and measure oil in the compressor. Check for
evidence of contamination to determine if rem ain­
der of system requires servicing. Compressor
servicing information is located in the Overhaul Manual.
Installation
1. If oil previously drained from the compressor upon
removal shows no evidence of contamination,
replace a like amount of fresh refrigeration oil into
the compressor before reinstallation. If it was
necessary to service the entire system because of
excessive contamination in the oil removed, install a
full charge of fresh refrigeration oil into the
compressor.
2. Position compressor on the mounting bracket and
install all nuts, bolts and lock washers.
3. Install the connector assembly to the compressor
rear head, using new "O " rings coated with clean
refrigeration oil.
4. Connect the electrical lead to the coil and install
and adjust compressor belt.
5. Evacuate, charge and check the system.
HEATER A N D AIR C O N D IT IO N IN G
G and Motor Home Chassis Models
Removal (Fig.
56)
1. Disconnect battery ground cable.
2. Disconnect compressor clutch connector.
3. Purge the system of refrigerant.
4. Release the belt tension at the idler pulley and
remove the belt from the compressor pulley. On
some vehicles it may be necessary to remove the
crankshaft pulley in order to remove the belt.
5. Models-Remove the front air conditioning
G
distributor duct described later in this section.
6. Models-Remove the two bolts and two clamps
G
that hold the engine cover and remove the cover.
7. Remove the air cleaner to aid access to the
compressor.
8. Remove fitting and muffler assembly and cap or
plug all open connections.
9. Remove the nuts and bolts attaching the compres­
sor to the bracket.
10. Remove the engine oil tube support bracket bolt
and nut from the compressor, also compressor
clutch ground lead.
11. Remove bolt and nut holding muffler assembly to
front of compressor (also holds vacuum line on
power assisted brake equipped vehicles; if neces­
sary, remove vacuum hose at manifold end).
Before beginning any compressor disassembly, drain and
measure oil in the compressor. Check for evidence of
contamination to determine if rem ainder of system
requires servicing. Compressor Servicing inform ation is
located in the Overhaul Manual.
Installation
1. If the oil drained from the compressor showed no
evidence of contamination, replace a like amount of
fresh refrigeration oil into the compressor before
reinstallation. If it was necessary to service the
entire system because of excessive contamination in
the oil removed, install a full charge of fresh
refrigeration oil in the compressor. (See Checking
Compressor Oil Charge in the Service Manual.)
2. Position compressor on the mounting bracket and
install all nuts, bolts, lock washers, and mount oil
dip stick tube, muffler, vacuum brake hose (if
equipped), and ground wire.
3. Install the connector assembly to the compressor
rear head, using new "O " rings coated with clean
refrigeration oil.
4. Connect the electrical lead to the coil and install
and adjust compressor belt, using idler pulley. See
"Compressor Belt Tension Adjustment."
5. Evacuate, charge and check the system.
6. Replace air cleaner. On G models, replace the
engine cover and air distributor duct.
1A-55
LIGHT DUTY TRUCK SERVICE MANUAL