Couple months ago the fridge stopped being cold. It turned out the freezer was all frosted up to the point where the little fan in the back was blocked. I defrosted the freezer, made sure the fan was turning, and then everything worked fine for a while. Now, the freezer is starting to frost up again, and the freezer temperature is in the 20's. So far the fridge is still cold but I have a feeling we are going down the same road. What makes this happen?
It's a kenmore bottom-freezer fridge, and judging by the hairstyles in the operating manual, I'd say it's about 35 years old. It has 2 controls, a "cold control" which we keep at about 2 out of 5, any higher the stuff in the fridge freezes, and an "air control" which I think is supposed to balance the coldness between the fridge and freezer. We have to keep that at about 4 out of 5, or likewise the stuff in the fridge freezes. So in short, the compressor and all that seems to work just fine, it seems to be a control problem of some sort.