My freezer is no longer cold enough, the ice cream started to melt and frozen meat became soft. I turned it off and cleaned the condenser coil which was pretty dusty. When I turned back on my evaporator coil fan did not work. The unit is 13 years old. Is the fridge still salvageable? Should I turn it on and see if the frost covers all of the evaporator coil, and if it does get a new fan, and if not to shop for a new one?