This MAHLE thermostat, part number TM 18 105, is designed to precisely control the engine's operating temperature. It opens and closes to regulate the flow of coolant through the radiator, ensuring the engine reaches and maintains its ideal thermal range. Proper functioning of the thermostat is crucial for fuel efficiency and reducing emissions. A faulty thermostat can lead to either the engine running too cold, impacting performance and wear, or overheating, which can cause severe engine damage. MAHLE is a trusted name in engine components, known for quality and reliability. This thermostat is built to meet stringent standards, providing dependable operation for your vehicle's cooling system.