This MAHLE thermostat, part code TM 1 105, is designed to precisely control the engine's operating temperature. By opening and closing at specific temperatures, it regulates the flow of coolant through the radiator, preventing overheating and ensuring the engine reaches its most efficient operating range quickly. Proper thermostat function is crucial for fuel economy and emissions control. A malfunctioning thermostat can lead to either an engine that runs too cold, reducing efficiency and potentially causing wear, or an engine that overheats, leading to severe damage. MAHLE thermostats are engineered for reliability and durability, providing consistent performance. This component is a key part of the cooling system, working in conjunction with the radiator, water pump, and coolant to maintain the ideal thermal balance within your vehicle's engine. Regular checks and timely replacement of the thermostat can prevent costly repairs down the line.