Daewoo Nubira Owner's Manual page 467

7B – 18IMANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
TEST RESULTS
Suction pressure ab- The low pressure hose and
normally high check joint are cooler than
the temperature around the
evaporator.
A capillary tube is loose.
The suction pressure is low-
ered when the condenser is
cooled by water.
The high and low pressures
are equalized as soon as
the compressor is stopped
and both gauges fluctuate
while the compressor is
running.
The high pressure valve is
faulty.
Foreign particles are stuck
in the high pressure valve.
Suction and dis- There is reduced airflow
charge pressure ab- charge pressure ab- through the condenser.
normally high charge normally high charge
The radiator cooling fans
are not working properly.
The condenser is exces-
sively hot.
Suction and dis- The low pressure hose and
charge pressure ab- themetal end areas are
normally low cooler than the evaporator.
The temperature around
the expansion valve is low
compared to that around
the receiver/drier.
Refrigerant leaks The compressor clutch is
dirty.
The compressor bolts are
dirty.
The compressor gasket is
wet with oil.
RELATED SYMPTOMS PROBABLE CAUSE
The expansion valve is opened
too long.
There is excessive refrigerant in
the system.
A gasket is faulty.
The condenser or the radiator fins
are clogged.
S Check the voltage and the ra-
diator cooling fan rpm.
S Check the fan direction.
There is excessive refrigerant in
the system.
There is a clogged or kinked low
pressure hose.
The high pressure line is clogged.
The compressor shaft seal is
leaking.
There is leaking around a com-
pressor housing bolt.
The compressor gasket is leak-
ing.
REMEDY
Replace the expansion
valve.
Recover, evacuate, and re-
charge the system.
Repair or replace the com-
pressor.
Clean the condenser and
the radiator.
Recover, evacuate, and re-
charge the system.
Repair or replace the low
pressure hose.
Repair or replace the high
pressure line.
Repair or replace the com-
pressor.
Tighten the bolt(s) or re-
place the compressor.
Repair or replace the com-
pressor.
DAEWOO V–121 BL4