The heat exchanger/evaporator can't freeze up if there is inadequate gas in the system.Also,a frozen evap would be accompanied by a lack of airflow through the air vents.If the gas charge is low,then the evap will not reach its desired temp and air will not be adequately cooled.This could cause excessive moisture to accumulate.I would also check the evap drain tube,to make sure there is no blockage of condensate escape.
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