Genuine OEM Audi Engine Coolant Thermostat, part number 059121111R. This component is crucial for regulating the engine's operating temperature, ensuring efficient performance and preventing overheating or undercooling. It is typically located within the engine cooling system, controlling coolant flow. Weighing 0.31 kg, this thermostat is engineered to factory specifications. Choosing a genuine OEM thermostat ensures accurate temperature calibration and reliable operation, critical for engine longevity.