Genuine OEM Audi Thermostat Housing with Thermostat, part number 079121115BG. This assembly is a critical component of the engine cooling system, responsible for regulating the flow of coolant. It ensures the engine reaches and maintains its optimal operating temperature quickly and efficiently, preventing both overheating and undercooling. Weighing 0.433 kg, this unit is precisely engineered for reliable temperature control. Choosing a genuine OEM thermostat housing with thermostat guarantees accurate temperature calibration and leak-free operation, essential for engine longevity and fuel efficiency.