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Abnormal high pressure of the high pressure pipeline
Abnormal low pressure of the high pressure pipeline
Abnormal high pressure of the low pressure pipeline
Abnormal low pressure of the low pressure pipeline
High and low pressure can not be established
Sight glass has air bubble
Compressor inlet side is frosted
Compressor noise
Abnormal heating on the compressor
Evaporator is frosted
Drier filter ices up
A/C does not refrigerate or the cold air is insufficient
Dirt in the evaporator core, or
poor fit between the
expansion valve sensing unit
and evaporator outlet
Check and correct it
Non-evaporated refrigerant
steam enters into compressor
Service the evaporator and its
components such as fan
expansion valve opening is
excessively big or faulty,
refrigerant supply is
excessive
Adjust the exp ansion valve,
check the sensing unit and the
evaporator outlet for fitness,
replace it as necessary
××
Expansion valve opening is
too small
Adjust expansion valve
××××
Expansion valve fault, spinal
corrosion or leakage
Replace exp ansion valve
×× ×
The refrigerant pipeline
between the expansion valve
sensing unit and the
expansion valve is damaged or
broken
Check and replace the
expansion valve and pipeline
××
Expansion valve blocked by
ice or dirt
Recycle the refrigerant,
remove and clean the
expansion valve, use the
vacuum pump to drain the
water in the system and then
refill the refrigerant
× Refrigerant pipeline blocked
Disassemble and check the
part
×
Compressor solenoid clutch,
bearing and pulley wear
Check and replace concerned
worn parts
××××××
Compressor reed is damaged,
exhaust valve leaks
Check and replace the
compressor
× Compressor inlet blocked Check and clean
× × Drive belt loose or broken Replace or replace it
×
Excessively low temperature
in the vehicle compartments
Adjust the selection switch
× × × × System pipeline leaks
Check the leak area, refill
proper amount of refrigerant
×××
Problem Symptom
Possible Cause Troubleshooting
××
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