Genuine OEM Volkswagen Upper Radiator Coolant Hose, part number 1C0122101BC. This hose is a critical component of the engine cooling system, responsible for carrying coolant from the engine to the radiator for cooling and then back to the engine. It is positioned at the top of the radiator assembly. Made from durable, heat-resistant rubber and reinforced to withstand engine temperatures and pressure. Genuine OEM hoses maintain precise dimensions and material integrity for reliable coolant flow and engine temperature regulation.