Daewoo NUBIRA, Owner'S Manual, Page: 467 / 744

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