I searched for "winterize lg fridge with ice maker"
found this:
Winterized my unit today couldn't find any info on line (web) on how to winterize an ice maker. Called my local dealer they stated to disconnect the infeed line and drain it. This would be fine for the water up to the valve located in the rear of the unit, after the valve and up to the ice maker would still be full of water which would result in freeze damage. So I called LG that was a joke, got 2 different techs not from the US they stated to do the same thing as my local dealer stated to do drain the line and if I wanted to go further to pull the refrigerator out drain the valve and the lines by disconnecting all lines from the valve unit. I figured this out before I talked with them, not so easy to do. To make a long story short I removed the ice tray and lower tray out of the freezer it's a French door with bottom freezer. I then took a mirror and found a test button near the front of the ice maker about 1/2" from the front on the underside, pushed it and out came the antifreeze, its a button that opens the valve for a cycle, only took 2 cycles and it was winterized. I'll do the same to dewinterized next spring a few cycles and the antifreeze will be gone.
Taken from here:
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