Genuine OEM Audi Engine Coolant Hose, part number 5Q0815369G. This critical component is responsible for transferring engine coolant throughout the cooling system, effectively regulating engine temperature and preventing overheating. It is an integral part of the engine cooling circuit. The hose weighs approximately 0.17 kg and is constructed from durable, heat-resistant rubber compounds designed to withstand high temperatures and pressures. Using a genuine OEM coolant hose guarantees the correct routing geometry, material composition, and resistance to coolant chemicals, preventing leaks and ensuring the long-term reliability of the engine cooling system.