Sabi nga pala ng mechanic, pumasok daw yung ants most likely through the aircon intake vent. Since full auto ang aircon, if the cabin gets cold enough, the intake vent opens so that outside air can go in. So yun nga, na-off siguro ang car na open ang vent. Anyone knows how to make the vent permanently closed when the a/c controls is auto? Kasi to turn on the aircon, we press auto, then yun automatic na yung settings, fan speed, etc depending on your desired temperature. I can make the intake vent manual by pressing it but when the aircon is turned off and on ulit, auto ulit sya. Its a Nissan Serena QRV.R Ltd btw.