Looks like your evaporator is forming frost.To check this see if the airflow reduces when the mist phenomenon you mentioned occurs.If yes your expansion valve is not functioning properly.This can occur while cleaning of the AC evaporator.
There are 2 temps concerned with the manual HVAC,the evaporator temp and the air temp close to the evaporator.The Evaporator temp must be at 0-1 C to prevent freezing of the evaporator and is controlled by the expansion valve by controlling the flow of refrigerant.The air temp is controlled by the thermostat and is set between 3-6C.
Even if your thermostat fails to cut off the compressor the evaporator core will never freeze because of the above arrangement.
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Last edited by merve_extreme : 9th August 2008 at 19:53.
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