kenmore ***-***-**** 4 tenant had freezer crammed with food. freezer cold but refer only cool. removed freezer food, and pulled fan cover. lots of ice in and around coils etc and fan frozen so it would not turn. thawed coil and fan area so that fan could operate normally. before I start worrying about defrost system could just having too much food in freezer blocking fan vents cause ice in and around coils and fan? also…temp control knob would not of course rotate so too much force may have damaged the controller. now rotates freely (maybe too freely) with just a hint of a detent at 12:00 and no stops at hi or low end of dial. is it toast?