I got a Amana
ASD2624HEB Side By Side fridge from a girl at my work. She had indicated that she woke up and the fridge had gone out and everything melted but I could have it if I wanted to fix it. When I went to pick it up it was plugged in and working. Figured she was nuts!

So we took it home and plugged it in and let it cool. Everything was fine and it even started making ice so I know it was at least 2 degrees in the freezer. YAY! Well this morning I woke up to water dripping down the freezer. I opened it up and the freezer was warm and the ice had melted.
Now when we got it working last night the dial was set at 6. Once it got to temp I turned it back to 4 which is the suggested setting. This morning when it was warm I wipped all the water out of it and turned the dial back to 6. It appeared to be cooling back down when I left this morning. Any ideas on what could be wrong with this thing? Could the dial just need to be kept on 6? Is there a thermostat? Help!
Thanks!