The Whirlpool WPW10316428 Refrigerator Defrost Heater Assembly melts frost and ice buildup on the evaporator coils to maintain proper cooling airflow. This electrical component activates during the defrost cycle and produces heat to clear accumulated ice from the evaporator surface. The melted frost drains through the defrost system, allowing air to circulate freely through the refrig... https://www.partsmelange.ca/whirlpool-wpw10316428-defrost-heater-assembly-for-refrigerator