Lower radiator coolant hose for X5, X6, E70, and E71 35i models. Part number 17127578703. Key benefits Ensures coolant circulation: This hose plays a critical role in moving coolant between the radiator and engine, supporting reliable cooling performance. Maintains engine temperature: By promoting proper coolant flow, it helps keep the engine at an operating temperature. Compatible materials: Constructed from materials designed to work with the vehicle's cooling system, reducing compatibility concerns. What this part does Function: Lower radiator coolant hose that supports the cooling circuit and temperature control. Compatibility: Suitable for X5, X6, E70, and E71 35i models. Material and build: Made from materials compatible with the vehicle cooling system. Performance: Helps maintain a steady engine temperature by ensuring consistent coolant flow. 23 practical use scenarios During cooling system maintenance or hose replacement on X5/X6 E70/E71 35i to restore proper coolant flow. After a coolant leak or hose wear to reestablish reliable circulation and temperature control. In hot climates or during load/ spirited driving to support effective cooling and reduce overheating risk. Notes Part number: 17127578703 Model fit: X5, X6, E70, E71 35i Function: Lower radiator coolant hose to aid coolant circulation and temperature maintenance