The drain is clogged. The picture is not good on the refrigerator, but if you pull out the refrigerator, right in the middle in the back, you will see a drain line going down to the pan on top of the compressor, where it will evaporate. Well, where it goes into the back is where it is clogged. So, take the screws out that hold the condensor coil to the back of the refrigerator, not all of them, just enough for you to get in there and remove the hose. On some of those older models, you can get to the drain cup from the inside of the refrigerator if the controls are in the back of the refrigerator. All you would have to do is kill the power to the refrigerator, and pull the dials off, and then take the 2 screws holding the panel on, off, and the cup will be right there for you to pull out and clean. I Think this will give you the general gist of you repair. Let me know how it goes. Tom ApplianceEducator.com