Remove the water line feed off fill valve behind fridge the feed line should drain if it was disconnected inside under sink and disconnect the line from the valve on top of valve, its feeding the ice maker.
Drop the wire fill switch lever so water drains out of 1/4" line.
Than I use paper towels to get water out of water tray.
Unplug the ice maker cord along with the refrigerator cord.
Leave the store latches engaged to keep doors open so you get no mold.
Go to the Quick Tips & Mods link for more info on winterizing.
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