The LG MEE63545701 Refrigerator Sheath Heater is a replacement heating element used to assist the defrost process in compatible refrigeration systems. This component is installed near the evaporator area inside the freezer section, where frost typically accumulates during normal operation. It operates by producing controlled heat during the defrost cycle, melting ice buildup on the evaporator coils so air can circulate properly through the system. The heater is connected to the unit’s defrost control circuit and activates at scheduled intervals to manage frost accumulation. By supporting the defrost process and maintaining clear airflow across cooling components, this part assists in stable temperature conditions and helps maintain consistent refrigeration performance.