Hi Jeanpierre,
haven't had the aircon serviced yet, but what I do is just do a little of brushing for the filter every three months. Took a peek at the the evaporator and it still looks clean.. That's the advantage of having an aircon filter, it (evaporator) keeps it clean, and prolongs it's life.
Btw, are you aware that some sorento units like in the States, don't have any aircon filters?




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