Sound like you have a defrost problem. The evaporator is behind the panel where the fan is. YOu will need to remove the panel, and test some of the defrosting components. Behind that panel are the heater and bi-metal. ( Bi-metal is also called defrost terminator ) the bi-metal looks like a little cylinder ( about the size of a stack of 8 quarters ) it should be attached to the freezing coils. With the refrigerator unplugged, make sure you have continuity through the bi-metal. This may involve cutting the wires to check, so leave enough wire to be able to splice back together if the bi-metal is good. ( The bi-metal must be ice cold before it will have continuity through it, as the heater heats up the coils it warms the bi-metal enough to loose continuity, therefore shutting the heater off ). Now with the bi-metal cold and no continuity through it, replace the bi-metal. If there is continuity, then check the heating element for continuity at both ends of its wires. If yu can check the ohm load on the heater it should read somewhere around 28ohms. If all these parts are good then it would have to be the defrost timer. If you had the model # I could go into further details on how to check the timer. Hope this helps
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