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A/C Bad Phenomenon
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A/C Pressure Condition
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Other Bad Phenomenon
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Result of Diagnosis (Primary Cause)
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Causes
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Counter Measures
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| Insufficient cooling, or no
cooling |
High pressure side is low, low pressure
side is low |
At first, bubbles appear after that
bubbles clear in the sight glass |
No air flow, or small air flow
volume |
Air flow leaks from between evaporator
unit and heater unit |
Close connection by mending tape or
sealing material |
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Malfunction of blower motor, or
defective electric circuit for motor |
Check electric circuit, or replace
blower motor |
| No cooling |
High pressure side is low, low pressure
side is high |
Low pressure side and high pressure
side equalize immediately after turning off the compressor |
--------------- |
Malfunction of compressor |
Repair, or replace of compressor |
| Insufficient cooling |
Low pressure side is high |
Low pressure piping is cooled
abnormally and frosted (returning liquid refrigerant) |
--------------- |
Loose contact of senser bulb to
evaporator outlet pipe, or insufficient insulation of sensor bulb |
Improve to contact and heat insulation
between sensor bulb and pipe, or replace sensor clip |
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Maladjusted expansion valve (too much
opened) |
Readjust TXV, or replace TVX |
| Insufficient cooling (Initially cooling
performance is normal but it becomes insufficient cooling gradually) |
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Louver outlet air flow decreases
gradually, when blower is 'ON' and A/C is 'OFF', much drain water comes out |
Evaporator coil icing, thermistor is
not cooled, or compressor clutch can be cut off when louver outlet air temp. is low enough |
Thermostat's 'cut off' setting point is
lower than original spec. |
Check thermistor, thermo amplifier and
mechanical thermostat |
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Sensor bulb of thermister or capillary
is installed improper place |
Check the place of thermo-sensor bulb
or capillary, if it is not proper, should be move to proper place |
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Evaporator coil icing, thermistor is
colded, or compressor clutch never cut off when louver outlet air temp. is low enough |
Thermistor or thermo-control amplifier
is malfunctioned (do not cut off) |
Check thermo system wiring, or replace
defective parts |
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From the beginning, air flow volume is
small |
Evaporator coil icing |
Air leakage of evaporator case |
Close evaporator case by packing or
mending tape |
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Air leakage from between heater unit
and evaporator unit |
Repair connection by packing |
