Water Hose BMW G20 G21 G30 G31 X3 G01 Diesel Cooling Coolant Pipe Line 8473704

BMW G20 G21 G30 G31 X3 G01 Water Hose Pipe Tube is a component from the Cooling System Hoses and Pipes group, designed for use in modern BMW diesel engines. It enables efficient coolant flow in the diesel engine, supporting stable operating temperatures and safe thermal load of components.

Specifications and technical data

• SKU: 8473704
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8473704
• Substitutable numbers: 8473704, 11538473704
• Fuel type: Diesel
• Category: Coolant Hoses

Purpose and Function in the Cooling System

The water hose used in the 3 Series G20/G21, 5 Series G30/G31, and X3 G01 models is responsible for the controlled flow of coolant between the cooling system components. This is particularly important in Diesel engines due to higher thermal loads during prolonged highway driving and operation under high torque.

A properly selected water hose helps to:

• maintain stable operating temperature of the powertrain,
• minimize the risk of localized overheating,
• ensure uniform coolant circulation throughout the system.

Compatibility with BMW Platforms

The component has been designed with the G20, G21, G30, G31 body architectures, and X3 G01 in mind, ensuring a fit for the engine bay geometry and cooling system routing in these generations. This allows the hose to maintain its correct path, avoid interference with other components, and enable proper mounting in factory bracket points.

The cooling system in modern BMWs requires hoses with appropriate diameters and shapes to ensure fluid flow aligns with manufacturer specifications. Using a hose dedicated to a specific platform reduces the risk of stress, leaks, and improper system bleeding.

Characteristics of a Used Part

The offered hose is a used BMW part, allowing for economical repair of the cooling system while maintaining original geometry and manufacturing standards. This type of component is particularly attractive for accident repairs, replacing a damaged hose after a leak, or for cooling system upgrades as part of preventative maintenance.

Choosing a used OEM water hose often provides a better fit than universal aftermarket alternatives, while also maintaining the structural integrity of the entire cooling system.

Importance of the Correct Hose in a Diesel Engine

BMW diesel engines of the G generation, used in the 3 Series, 5 Series, and X3 models, operate under high thermal load, especially during high-speed driving or when carrying loads. An efficient water hose directly impacts:

• maintaining the correct temperature of the engine head and block,
• stable operation of accessories connected to the cooling system,
• reducing the risk of failures due to overheating.

Replacing a worn or damaged hose with the correct part from the Cooling System Hoses and Pipes group is one of the key steps in diagnosing overheating issues or coolant loss.

Technical Support and Additional Materials

To better understand the impact of hoses and pipes on powertrain durability and the symptoms of cooling system malfunction, it is worth reading the guide: Engine Cooling System – Overheating, Repair, and Used Radiators. The article discusses practical aspects of diagnostics and servicing that help in choosing the right repair strategy.

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other parts from the same group, such as additional pipes, return hoses, or sections connecting the radiator to the engine, check the available parts in the BMW Cooling System Hoses and Pipes category.