|
A/C Bad Phenomenon
|
A/C Pressure Condition
|
Other Bad Phenomenon
|
Result of Diagnosis (Primary Cause)
|
Causes
|
Counter Measures
|
| Insufficient cooling |
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Normal air flow condition |
Icing of TXV |
Water in refrigeration circuit |
Replace R/D, charge regulated amount of
refrigerant after evacuation |
| Insufficient cooling |
Normal pressure |
Outlet air temperature is high
(refrigeration circuit is normal condition) |
--------------- |
Fresh air leaks into evaporator case
inspite of recirculation mode |
Readjust fresh / recirculation air's
switching damper |
|
|
|
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Air is warmed by heater (due to
malfunctioned water flow control valve, or heat air leaks into evaporator case, or air mix damper
is not fully closed) |
Check and adjust water valve and air
mix damper |
|
|
|
|
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Thermostat operating temperature is not
properly |
Check mechanical thermostat,
thermistor, electric thermo amplifier, thermo variable resistor |
|
|
|
Outlet air temperature is normally
cold, but air flow volume is small |
--------------- |
Evaporator coil fin is stuffed |
Clean evaporator coil or replace
evaporator coil |
|
|
|
|
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Blower motor speed is slow |
Check or replace blower motor |
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|
|
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Blower intake is stuffed |
Check and repair blower intake |
