All window air conditioners will remove moisture from the air if there is any. Most window air conditioners collect this moisture in the bottom pan of the air conditioner and attempt to evaporate the moisture. The evaporation process works as follows: First, the water drips down off of the cold evaporator coils on the front of the unit. Then the water collects in the bottom of the air conditioner base, the "pan." If the air conditioner is installed properly it will be tilted slightly back.
The water then collects near the back of the unit. On some units, the fan blade used to cool the rear condensing coils will have a rim on the outside of the fins of the blade. This rim, or "slinger," will come close to touching the inside of the air conditioner pan when the fan is spinning. As the water collects in the pan and reaches the depth necessary for the fan ring to touch it, the ring will lift some of the water up and the fan will blow it at the condensing coils. Because the coils are warm, they will evaporate the moisture to the outside.
While this is happening it is normal to hear water splashing and sloshing around. As long as there is no water leaking inside the room that is being cooled there is no cause for concern.
Never drill into the bottom of and air conditioning unit to "let the water out."
thanks for the great explanation, imjustavg, but is there a way to drain it before we take it out of the window and get soaked?
Normally if you either let it set - shut off for several days or with fan only it will all evaporate or if you don't have the time to do that tilt it back for a half hour or so and let it drain outside.
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