They defrost automatically every now and again.
Little beads of ice are melted and the resulting water runs down the back of the fridge on the inside and out through a hole - your hole is blocked and needs to be cleaned out with something flexible like a piece of wire.
You can often see gutters for the drain meeting where the hole is.
The water you see at the bottom comes from up above.
Peccavi
April 2013
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