The refrigerator on this model works just fine. Getting temps in mid 30's. The freezer is the problem. It only gets to about 20-25 degrees. I pulled the entire panel inside the freezer and found the fan runs fine and the coils are totally clear no frost build up at all. It just wont get cold enough to freeze to keep items frozen. What could be wrong and what do I need to fix this problem. This is a 2nd frig that we keep in the garage. But would like the freezer to work. Please help