Ungas,

Kalokohan yata yun ha. Ewan ko lang. Hindi kasi service item ang drier, eh. Paano dudumi ang freon? Closed system iyon. Unless nacocontaminate dahils sa 'preventive' aircon cleaning thingie or nagleak ang system and contaminants found their way in (which is remote since pinhole size lang namang ang butas ng a/c system kadalasan).