Genuine OEM Volkswagen Upper Radiator Coolant Hose, part number 5Q0122101DT. This critical hose assembly is responsible for transporting engine coolant between the engine and the upper section of the radiator, maintaining proper operating temperatures. Weighing approximately 0.95 kg, it is a complex molded assembly designed for specific routing. Using a genuine OEM coolant hose ensures correct fluid resistance, precise routing geometry, and reliable leak-free performance under varying engine temperatures and pressures.