Engine Idle Compensator; Compressor - Chevrolet 1980 Light Duty Truck Service Manual

1B-32 AIR C O N D ITIO N IN G
Fig. 1 B-25~Checking E vaporator Inlet and A cu u m u la to r
O utlet Tem peratures
1. A physical perforation to the accumulator is found
resulting in a leak.
2. The expansion tube (orifice) screen is plugged.
3. The compressor inlet screen is plugged.
4. An evaporator fails because of inside-out (internal)
corrosion.
DO NOT REPLACE the accumulator assembly when:
1. Merely a dent is found in the outer shell of the
accumulator.
2. A vehicle is involved in a collision and no physical
perforation to the accumulator is found. An open refrigerant
line should be capped or have a plastic bag tightly taped
around it.
ENGINE IDLE CO M PENSATO R
This additional aid to prevent stalling during prolonged
hot weather periods is included with all air conditioned
vehicles. The idle compensator is a thermostatically
controlled air bleed which supplies additional air to the idle
mixture. On V-8 engines, with factory installed air
conditioning systems, the compensator is located within the
carburetor and is accessible when the engine air cleaner is
removed.

COMPRESSOR

C-K SERIES
Removal (Fig. 1B-33)
1. Discharge the system.
2. Remove connector attaching bolt and connector.
Cap or plug open connections at once.
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 compressor
brackets to the mounting bracket. Remove the compressor.
6. Before beginning any compressor disassembly,
drain and measure oil in the compressor. Check for evidence
of contamination to determine if remainder of system
requires servicing. Compressor servicing information is
located in the Unit Repair 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.
G and M otor Home Chassis Models
Removal (Fig. 1B-26)
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 bit from the compressor pulley. On some
vehicles it may be necessry to remove the crankshaft pulley
in order to remove the belt.
5. --Remove the two bolts and two clamps
G Series
that hold the engine cover and remove the cover.
6. Remove the air cleaner to aid access to the
compressor.
7. Remove fitting and muffler assembly and cap or
plug all open connections.
8. Remove the nuts and bolts attaching the compressor
to the bracket.
9. Remove the engine oil tube support bracket bolt and
nut from the compressor, also compressor clutch ground
lead.
Before beginning any compressor disassembly, drain
and measure oil in the compressor. Check for evidence of
contaimination to determine if remainder of system requires
servicing. Compressor Servicing information is located in
the Unit Repair 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 Diagnosis Section
of this Service Manual.)
2. Position compressor on the mounting bracket and
install all nuts, bolts, lock washers, and ground wire.
3. Install the connector assembly to the compressor
rear head, using new "O" ring 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.
LIG H T T R U CK S ER V IC E M AN UAL