This FEBI BILSTEIN thermostat (part code 109338) is designed to maintain your engine's ideal operating temperature. By precisely controlling the flow of coolant through the radiator, it prevents overheating and ensures efficient engine function. A properly functioning thermostat is crucial for fuel economy and reducing emissions. When the engine is cold, the thermostat remains closed, allowing the engine to reach its optimal operating temperature faster. Once the target temperature is reached, the thermostat opens to allow coolant circulation, preventing the engine from overheating during demanding conditions. FEBI BILSTEIN is known for producing high-quality components that meet or exceed original equipment specifications. This thermostat is built with durable materials to withstand the high temperatures and pressures within the cooling system, offering reliable performance and a long service life.