Genuine OEM Volkswagen Engine Coolant Thermostat Housing, part number 03L121114B. This component serves to enclose the engine coolant thermostat, providing a secure and sealed environment for its operation within the cooling system. It directs coolant flow and is crucial for maintaining the engine's optimal operating temperature. Weighing 0.05 kg, this housing is typically constructed from high-grade plastic or metal, designed to withstand thermal stress and pressure. Using a genuine OEM thermostat housing ensures precise fitment, proper sealing, and long-term reliability, preventing coolant leaks and ensuring efficient engine cooling.