7B–12 MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO M-150 BL2
Pressure Test Chart (R-134a System) (Cont’d)
Condition
Related Symptons
Probable Cause
Correction
ÁÁÁÁÁ
Suction Pressure
Abnormally High
ÁÁÁÁÁÁÁÁ
D Low pressure hose and
check joint are cooler
ÁÁÁÁÁÁÁÁÁ
D The expansion valve is
opened for too long.
ÁÁÁÁÁÁÁÁ
D Replace the expansion
valve.
Abnormally High
check joint are cooler
than the temperature
around the evaporator.
opened for too long.
valve.
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Suction pressure is
lowered when the con-
denser is cooled by
water.
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
D There is excessive
refrigerant in the system.
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Recover, evacuate, and
recharge the system.
Suction and Dis-
charge Pressure
D Reduced airflow
through the condenser.
D The condenser or the
radiator fins are clogged.
D Clean the condenser and
the radiator.
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁ
Abnormally High
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
D The radiator cooling fans
are not working properly.
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Check the voltage and
the radiator cooling fan
rpm.
D Check the fan direction.
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Condenser is
excessively hot.
ÁÁÁÁÁÁÁÁÁ
D There is excessive
refrigerant in the system.
ÁÁÁÁÁÁÁÁ
D Recover, evacuate, and
recharge the system.
ÁÁÁÁÁ
ÁÁÁÁÁ
Suction and Dis-
charge Pressure
Abnormally Low
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Low pressure hose and
metal end areas are
cooler than the
evaporator.
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
D Clogged or kinked low
pressure hose.
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Repair or replace the low
pressure hose.
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Temperature around the
expansion valve is low
compared to that
around the
receiver/drier.
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁ
D The high pressure line is
clogged.
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D Repair or replace the
high pressure line.
ÁÁÁÁÁ
Refrigerant Leaks
ÁÁÁÁÁÁÁÁ
D The compressor clutch
is dirty.
ÁÁÁÁÁÁÁÁÁ
D The compressor shaft seal
is leaking.
ÁÁÁÁÁÁÁÁ
D Repair or replace the
compressor.
D The compressor bolts
are dirty.
D Leaking around a
compressor housing bolt.
D Tighten the bolt(s) or
replace the compressor.
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
D The compressor gasket
is wet with oil.
ÁÁÁÁÁÁÁÁÁ
D The compressor gasket is
leaking.
ÁÁÁÁÁÁÁÁ
D Repair or replace the
compressor.
ÁÁÁÁÁ
ÁÁÁÁÁÁÁÁ
–
ÁÁÁÁÁÁÁÁÁ
D Poor tightening in the
system.
ÁÁÁÁÁÁÁÁ
D Retighten the connection
(coupling, bolt etc.)
–
D O–ring is faulty.
D Replace the O–ring.