The reason for Air conditioner drain fault is that auto air conditioning evaporator use for some time by responding to the micro dust particles into the car environment. When accumulated cannot evaporate even evaporator clogging, Poor evaporation efficiency drainage blocked. This is because of evaporation absorbs moisture inside the car lot of hoarding is unable to drain out. Therefore, usually this happens will cause a leak inside the car which is very troubled by a troubleshooting.