cleaning of the a/c system should be done periodically but not necessarily every year.at least pag mahina na yung buga ng blower; meaning madumi na yung cooling coil. the dirt and debris in the cooling coil lessens the aircon's efficiency to cool down the car, plus it corrodes the metal fins of the coil kaya nagkakaroon ng leaks. unlike sa mga bagong cars na may built in filter na yung aircon nila.

ungas,

hindi ba ni-leak test yung evaporator mo habang nililinis?