Genuine OEM Audi Engine Coolant Thermostat, part number 059122111D. This vital component regulates the flow of coolant through the engine, maintaining optimal operating temperature for peak performance and efficiency. It is typically located within the engine cooling system, often near the engine block or cylinder head. Constructed from durable plastic, this thermostat weighs approximately 0.11 kg. Choosing a genuine OEM thermostat ensures accurate temperature calibration and reliable operation, preventing engine overheating or undercooling and protecting critical engine components.