The Frigidaire 5303918568 Defrost Thermostat for Refrigerator helps maintain proper cooling performance by regulating the defrost cycle. This replacement thermostat is designed to monitor the temperature of the evaporator and control the operation of the defrost heater when needed. It works by allowing the heater to activate during the defrost cycle and shutting it off once the approp... https://www.partsmelange.ca/frigidaire-5303918568-defrost-thermostat-for-refrigerator