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problem with temperature

zackpuse on Thu August 01, 2013 10:00 PM User is offline

Year: 1996
Make: proton
Model: wira
Engine Size: 1600
Refrigerant Type: sanden
Ambient Temp: 29°C.
Pressure Low: 31 psi
Pressure High: 240 psi
Country of Origin: Malaysia

1# situation
- my car air conditional got temperature 0°C.
- evaporator got froze
# possible cause - expansion valve choke / refrigerant not enough make evaporator froze.

2# situation
- service change new expansion valve
- after service my car air conditional got temperature -8°C.
- at this moment my evaporator looking good
- water condensation flow from discharge pipe to much
# possible cause - under investigation
anyone have solution

TRB on Fri August 02, 2013 6:26 PM User is offlineView users profile

Is it freezing up?


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mk378 on Fri August 02, 2013 7:05 PM User is offline

An expansion valve is not designed to control the evaporator to any particular temperature. It controls the refrigerant flow to make it as cold as possible given the operating conditions. It sounds like you took out a good valve and put in another good one.

There is usually an electrical sensor to sense the evaporator temperature and shut off the compressor before it gets cold enough to freeze.

Either that or a variable compressor or a suction throttling valve. These pressure-controlled systems, though otherwise good working order, can freeze if the refrigerant is contaminated with air (caused by not evacuating before charging).

Edited: Fri August 02, 2013 at 7:08 PM by mk378

zackpuse on Thu August 29, 2013 1:17 AM User is offline

thanks.. change new compressor. temperature and pressure normal

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