I have a bottom freezer on my maytag fridge, and once a week I have to clear out a very thick layer of ice that forms at the bottom of the freezer, as it starts to overflow with water onto my floor. We have looked for a drain hose, or anything that could be clogged and can't find anything of the sort. Could someone advise on how to stop the ice from collecting, and where there may be a valve as we can't find anything, and/or a schismatic of where to find and fix. thanks