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Daewoo Matiz (2003 year). Manual - part 196

7B – 10 MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

Insufficient Cooling Diagnosis (Cont’d)

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Step

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Action

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Value(s)

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Yes

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1. Turn the ignition switch OFF.
2. Turn the A/C switch to the OFF position.
3. Attempt to turn the clutch driver (not the pulley).
Can you turn the clutch driver freely by hand?

–

Go to Step 23

Go to Step 21

1. Recover the A/C system refrigerant.
2. Replace the A/C compressor.
3. Evacuate and recharge the A/C system.
Is the repair complete?

–

System OK

–

1. Add the refrigerant R–134a.
Does the cooling performance improve?

–

System OK

Go to Step 23

1. Recover the A/C system refrigerant.
2. Replace the compressor.
3. Evacuate and recharge the A/C system.
4. Check the A/C system for leaks.
Is the repair complete?

–

System OK

–

MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B – 11

SYMPTOM DIAGNOSIS

PRESSURE TEST CHART (R-134A SYSTEM)

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Condition

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Related Symptons

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Probable Cause

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Correction

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Discharge (high)
Pressure
Abnormally High

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After stopping the com-
pressor, the pressure
drops quickly, then falls
gradually.

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There is air in the system.

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Recover, evacuate and
recharge the system with
the specified amount of
refrigerant.

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The condenser is
excessively hot.

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There is excessive
refrigerant in the system.

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Recover, evacuate and
recharge the system with
the specified amount of
refrigerant.

ÁÁÁÁÁÁÁ

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Reduced or no air flow
through the condenser.

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The condenser or the
radiator fins are clogged.

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Clean the condenser or
the radiator fins.

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The condenser or the
radiator fan is not working
properly.

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Check the voltage and
the fan rpm.

Check the fan direction.

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Line to the condenser is
excessively hot.

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Restricted flow of
refrigerant in the system

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Locate and repair the
restriction.

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Discharge
Pressure
Abnormally Low

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The condenser is not
hot.

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Insufficient refrigerant in the
system.

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Check the system for a
leak.

Charge the system.

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High and low pressures
are balanced soon after
stopping the

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Faulty compressor.

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Repair or replace the
compressor.

ÁÁÁÁÁÁÁ

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stopping the
compressor. Low side
pressure is higher than
normal.

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The outlet of the
expansion valve is not

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Faulty expansion valve.

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Replace the expansion
valve.

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frosted, low pressure
gauge indicates
vacuum.

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Moisture in the system.

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Recover, evacuate, and
recharge the system.

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Suction (low)
Pressure
Abnormally Low

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Condenser is not hot.

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Insufficient refrigerant in the
system.

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Repair the leaks.
Recover, evacuate, and
recharge the system.

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The expansion valve is
not frosted and the low
pressure line is not

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Frozen expansion valve.

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Replace the expansion
valve.

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pressure line is not
cold. Low pressure
gauge indicates a
vacuum.

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Faulty expansion valve.

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Discharge temperature
is low and the air flow
from the vents is
restricted.

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The evaporator is frozen.

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Clear the restricted
evaporator case drain.

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The expansion valve is
frosted.

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The expansion valve is
clogged.

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Clean or replace the
expansion valve.

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The receiver/dryer
outlet is cool and the
inlet is warm.

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The receiver/dryer is
clogged.

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Replace the
receiver/dryer.

7B – 12 MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM

Pressure Test Chart (R-134a System) (Cont’d)

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Condition

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Related Symptons

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Probable Cause

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Correction

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Suction Pressure
Abnormally High

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Low pressure hose and
check joint are cooler

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The expansion valve is
opened for too long.

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Replace the expansion
valve.

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Abnormally High

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check joint are cooler
than the temperature
around the evaporator.

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opened for too long.

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valve.

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Suction pressure is
lowered when the con-
denser is cooled by
water.

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There is excessive
refrigerant in the system.

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Recover, evacuate, and
recharge the system.

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Suction and Dis-
charge Pressure

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Reduced airflow
through the condenser.

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The condenser or the
radiator fins are clogged.

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Clean the condenser and
the radiator.

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Abnormally High

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The radiator cooling fans
are not working properly.

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Check the voltage and
the radiator cooling fan
rpm.

Check the fan direction.

ÁÁÁÁÁÁÁ

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Condenser is
excessively hot.

ÁÁÁÁÁÁÁÁÁÁÁ

There is excessive
refrigerant in the system.

ÁÁÁÁÁÁÁÁÁÁ

Recover, evacuate, and
recharge the system.

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Suction and Dis-
charge Pressure
Abnormally Low

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Low pressure hose and
metal end areas are
cooler than the
evaporator.

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Clogged or kinked low
pressure hose.

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Repair or replace the low
pressure hose.

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Temperature around the
expansion valve is low
compared to that
around the
receiver/drier.

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The high pressure line is
clogged.

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Repair or replace the
high pressure line.

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Refrigerant Leaks

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The compressor clutch
is dirty.

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The compressor shaft seal
is leaking.

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Repair or replace the
compressor.

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The compressor bolts
are dirty.

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Leaking around a
compressor housing bolt.

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Tighten the bolt(s) or
replace the compressor.

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The compressor gasket
is wet with oil.

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The compressor gasket is
leaking.

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Repair or replace the
compressor.

ÁÁÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁ

–

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Poor tightening in the
system.

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Retighten the connection
(coupling, bolt etc.)

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–

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O–ring is faulty.

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Replace the O–ring.

MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B – 13

REPAIR INSTRUCTIONS

ON-VEHICLE SERVICE

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.

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.

Keep all metal tubing lines free of dents or kinks. Any
line restrictions will cause the loss of system capacity.

Never bend a flexible hose line to a radius of less than
four times the diameter of the hose.

Never allow a flexible hose line to come near the ex-
haust manifold.

Inspect flexible hose lines regularly for leaks or brittle-
ness.

Replace flexible hose lines with new lines if you find
signs of deterioration or leaking.

Discharge the refrigeration system of all refrigerant
before disconnecting any fitting in the refrigeration
system.

Proceed very cautiously regardless of the gauge
readings.

Open the fittings very slowly.

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.

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.

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.

Back up the opposing fitting to prevent distortion of
the connecting lines or the components.

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.

Keep the O-rings and the seats in perfect condition. A
burr or a piece of dirt may cause a refrigerant leak.

Dip new O-rings in clean PAG refrigerant oil before
installation.

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