BMW 3 E46 M47N 318d 320d Engine Coolant Radiator Water Hose Pipe Diesel 2249778

BMW 3 E46 M47N 318d 320d Engine Coolant Radiator Water Hose Pipe is an original cooling system component designed for BMW 3 Series E46 diesel engines. Thanks to its factory-spec fitment, it ensures stable coolant flow and proper integration with other system components. It is a practical solution for users who want to maintain the structural integrity of the cooling system in their vehicle.

Specifications and technical data

• SKU: 2249778
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 2249778
• Substitutable numbers: 11532249778, 2249778, BG
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the cooling system

The offered water hose is a part of the Hoses, pipes and lines category, responsible for transporting coolant between diesel engine components. For M47N units in 318d and 320d models, proper fluid flow is crucial for maintaining a stable operating temperature and protecting the cylinder head, engine block, and accessories from overheating.

Using a hose designed in accordance with the original BMW factory specifications allows for maintaining:

• the correct diameter and geometry for coolant flow,
• proper routing in the engine bay, minimizing the risk of abrasion,
• compatibility with cooling system connectors, joints, and clamps.

Benefits of using an original BMW hose

In the case of diesel engines, such as the M47N units, the cooling system operates under significant thermal load. Using a water hose sourced from BMW ensures:

• a secure fit for the specific diesel engine configuration,
• preservation of the factory hose routing, which facilitates service and diagnostics,
• consistency with other cooling system elements, such as the radiator or water connectors.

For users who want to keep their car in a configuration close to factory standards, choosing an original water hose is a technically safe and predictable solution in terms of operation.

Characteristics of the used component

The hose comes from dismantling, which means it is a used part, but still suitable for further use. Such components are popular choices when servicing older generations of BMW because they:

• maintain compliance with the manufacturer's original design,
• allow for the optimization of cooling system repair costs,
• reduce the risk of fitment issues typical of aftermarket parts with universal geometry.

Replacing a water hose with an original used part is particularly sensible when the existing hose shows signs of wear, hardening, cracking, or leaks in the connection areas.

Selection by part numbers and compatibility with the diesel system

The component has been designed to work with diesel-powered engines, which is significant in terms of operating temperature and thermal load characteristics. When selecting a water hose for a BMW E46 318d or 320d, it is worth using the manufacturer's markings and interchangeable numbers to confirm full compatibility with the specific version of the M47N unit and accessory configuration.

For users who want to delve deeper into the topic of selecting original used BMW parts by OEM and reference numbers, the following article describing selection procedures and practical examples may be helpful: BMW – sports performance and precision with original used parts.

Expanding the BMW cooling system

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

This approach allows you to replace several critical cooling system components in one service stage, reducing the risk of subsequent leaks and failures resulting from varying degrees of wear on individual hoses.