Myf ridge was making an awful racket, it was not cooling normally so it was shut down . The fridge was restarted after some hours when the repairman came. He said it needed a new fan motor. He replaced the old one with a substitute. The noise has stopped, the fan is working but the freezer is not freezing and the fridge is not cold. The coils are not frozen over except for a small isolated area on the top right side. What is the problem with my R fridge?