Symptom Diagnosis; Pressure Test Chart (R-134A System) - Daewoo MATIZ Service Manual

MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B – 11
Condition
D After stopping the com-
Discharge (high)
Pressure
Abnormally High
D The condenser is
D Reduced or no air flow
D Line to the condenser is
D The condenser is not
Discharge
Pressure
Abnormally Low
D High and low pressures
D The outlet of the
D Condenser is not hot.
Suction (low)
Pressure
Abnormally Low
D The expansion valve is
D Discharge temperature
D The expansion valve is
D The receiver/dryer
DAEWOO M-150 BL2

SYMPTOM DIAGNOSIS

PRESSURE TEST CHART (R-134A SYSTEM)

Related Symptons
pressor, the pressure
drops quickly, then falls
gradually.
excessively hot.
through the condenser.
excessively hot.
hot.
are balanced soon after
stopping the stopping the
compressor. Low side
pressure is higher than
normal.
expansion valve is not
frosted, low pressure
gauge indicates
vacuum.
not frosted and the low
pressure line is not pressure line is not
cold. Low pressure
gauge indicates a
vacuum.
is low and the air flow
from the vents is
restricted.
frosted.
outlet is cool and the
inlet is warm.
Probable Cause
D There is air in the system.
D There is excessive
refrigerant in the system.
D The condenser or the
radiator fins are clogged.
D The condenser or the
radiator fan is not working
properly.
D Restricted flow of
refrigerant in the system
D Insufficient refrigerant in the
system.
D Faulty compressor.
D Faulty expansion valve.
D Moisture in the system.
D Insufficient refrigerant in the
system.
D Frozen expansion valve.
D Faulty expansion valve.
D The evaporator is frozen.
D The expansion valve is
clogged.
D The receiver/dryer is
clogged.
Correction
D Recover, evacuate and
recharge the system with
the specified amount of
refrigerant.
D Recover, evacuate and
recharge the system with
the specified amount of
refrigerant.
D Clean the condenser or
the radiator fins.
D Check the voltage and
the fan rpm.
D Check the fan direction.
D Locate and repair the
restriction.
D Check the system for a
leak.
D Charge the system.
D Repair or replace the
compressor.
D Replace the expansion
valve.
D Recover, evacuate, and
recharge the system.
D Repair the leaks.
Recover, evacuate, and
recharge the system.
D Replace the expansion
valve.
D Clear the restricted
evaporator case drain.
D Clean or replace the
expansion valve.
D Replace the
receiver/dryer.