Genuine OEM Volkswagen Thermostat Housing, part number 032121111AP. This critical component encloses the engine thermostat, playing a vital role in regulating engine operating temperature by controlling coolant flow. It features multiple ports for various coolant hoses, ensuring proper circulation throughout the cooling system. Weighing approximately 0.618 kg. Opting for a genuine OEM thermostat housing guarantees precise fitment, durable materials resistant to thermal cycling and coolant chemicals, and correct sealing surfaces to prevent leaks.