This FEBI BILSTEIN thermostat, part number 104981, is designed to regulate the engine's operating temperature. It plays a crucial role in the cooling system by controlling the flow of coolant to the radiator. Proper functioning of the thermostat is essential for preventing engine overheating and maintaining fuel efficiency. A faulty thermostat can lead to either an engine running too cold or too hot, both of which can cause significant damage over time. FEBI BILSTEIN is known for producing high-quality engine components. This thermostat is manufactured to meet stringent standards, ensuring reliable performance and durability for your vehicle's cooling system.