I'm not a fridge tech, but I have a Samsung in my garage after it constantly gave us this problem. I just removed the cover to the evaporator and let it ice up

I'm not a fridge tech, but I have a Samsung in my garage after it constantly gave us this problem. I just removed the cover to the evaporator and let it ice up, and don't keep much in it. A second thermostat shows that the interior is still maintaining a safe temperature, with few things inside and a non-functioning fan. The (suspected) problem is that the defroster heater is too far from the circulation fan, and the ice starts where the copper pipe is from the top, where there is no heater coil. The ice eventually grows to the fan, and seizes up the fan.