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MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B – 13
GENERAL A/C SYSTEM
SERVICE PROCEDURES
O-RING REPLACEMENT
Important: Even though O-rings may look identical, it is
extremely important that only recommended service re-
placement air conditioning O-rings be used, or exces-
sive leakage of refrigerant may occur.
Important: Always slip the O-ring onto the flange tube
to ensure proper locating and sealing.
Install new DAEWOO-approved service replacement air
conditioning O-rings whenever a joint or a fitting is disas-
sembled, except when the O-rings are provided on new
components.
When replacing O-rings on an air conditioning compo-
nent or a joint connection, the fitting design should be
identified to ensure installation of the correct air condi-
tioning service replacement O-ring.
Before installation, verify that both O-rings and fittings
have not been nicked or deformed. Deformed or nicked
parts must be replaced. Failure to use the proper service
replacement parts and procedures may result in exces-
sive refrigerant leakage.
HANDLING REFRIGERANT
Caution: Always work in a well-ventilated area and
avoid breathing any refrigerant fumes. If you have
difficulty breathing, seek medical attention immedi-
ately. If refrigerant comes in contact with any part of
your body, flush the exposed area with water. If a
rash or pain develops, seek medical attention.
Air conditioning systems contain refrigerant. This is a
chemical mixture which requires special handling proce-
dures to avoid personal injury.
Always wear goggles and wrap a clean cloth around the
fittings, the valves and the connections when performing
work that involves opening the refrigerant system. Do
not weld or steam clean on or near any vehicle-installed
air conditioning lines or components.
All refrigerant drums are shipped with a heavy metal
screw cap. The purpose of the cap is to protect the valve
and the safety plug from damage. It is good practice to
replace the cap after each use of the drum.
If it is necessary to transport or carry any container of
refrigerant in a vehicle, do not carry it in the passenger
compartment.
DAEWOO M-150 BL2
REPAIR INSTRUCTIONS
ON-VEHICLE SERVICE
HANDLING OF REFRIGERANT LINES
AND FITTINGS
Notice: Using too low or too high torque when tightening
a fitting can result in loose joints or deformed joint parts.
Both conditions can result in refrigerant leakage.
D Keep all metal tubing lines free of dents or kinks. Any
line restrictions will cause the loss of system capacity.
D Never bend a flexible hose line to a radius of less than
four times the diameter of the hose.
D Never allow a flexible hose line to come near the ex-
haust manifold.
D Inspect flexible hose lines regularly for leaks or brittle-
ness.
D Replace flexible hose lines with new lines if you find
signs of deterioration or leaking.
D Discharge the refrigeration system of all refrigerant
before disconnecting any fitting in the refrigeration
system.
D Proceed very cautiously regardless of the gauge
readings.
D Open the fittings very slowly.
D Keep your face and your hands away from the fitting
so that you will not be injured if there happens to be
liquid refrigerant in the line.
D If you notice pressure when you loosen a fitting, allow
the pressure to bleed off as described under "Dis-
charging, Adding Oil, Evacuating and Charging Pro-
cedures for A/C System" in this section.
D Cap or tape any refrigerant line immediately after it is
opened. This will prevent the entrance of moisture
and dirt, which can cause internal compressor wear
or plugged lines in the condenser, the evaporator
core, the expansion valve or the compressor inlet
screens.
Important: Use two proper wrenches to connect the O-
ring fittings.
D Back up the opposing fitting to prevent distortion of
the connecting lines or the components.
D Back up both the swaged fitting on the flexible hose
connections and the coupling to which it is attached
with two wrenches to prevent turning the fitting and
damaging the ground seat.
D Keep the O-rings and the seats in perfect condition. A
burr or a piece of dirt may cause a refrigerant leak.
D Dip new O-rings in clean PAG refrigerant oil before
installation.
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