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Here is the part you need to replace:
Refrigerator defrost temperature sensor Part #6615JB2005C: click here
here are the instructions - click here
also Thanks for the rating, if you have any trouble with changing it out let me know, also before ordering if you have a meter , you may want to check the defrost heater for continuity just to make sure the heater is good, its attached to evaporator you can test it at the plug, just unplug it from the wiring harness. It fairly rare for the heater to go out about 98% of the time its the part I told you to order that causes that problem but you can double check if you would like.