Whirlpool WP4387490 Refrigerator Bimetal Defrost Thermostat

The Whirlpool WP4387490 bimetal defrost thermostat helps regulate the refrigerator’s defrost cycle by monitoring temperature near the evaporator. This component uses a bimetal mechanism that responds to temperature changes, helping control the defrost heater by opening or closing the electrical circuit at specific temperature points.