Genuine OEM Volkswagen Engine Coolant Thermostat Housing, part number 06L121111M. This critical component houses the engine thermostat and precisely directs the flow of coolant throughout the engine's cooling system. It is integral to maintaining optimal engine operating temperature. Constructed from durable, heat-resistant plastic, this housing weighs approximately 1.33 kg. Choosing a genuine OEM thermostat housing ensures proper coolant regulation, preventing engine overheating or undercooling, and guarantees compatibility with the complex cooling system.