BMW 3 Series E46 M47N Radiator Coolant Water Hose Pipe 7789718

BMW 3 Series E46 M47N Radiator Coolant Water Hose Pipe is an original cooling system component designed for the precise routing of coolant between the radiator and the engine. Thanks to its factory geometry and perfect fit for the M47N unit, it ensures stable fluid flow, supporting proper engine operating temperature and safe heat dissipation. This is a practical solution for users looking for a proven cooling hose for their BMW.

Specifications and technical data

• SKU: 7789718
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7789718
• Substitutable numbers: 11537789718, 7789718, EM
• Category: Coolant Hoses

Purpose and function in the cooling system

The radiator coolant water hose in the BMW E46 with the M47N engine is responsible for transporting coolant between key system components. A properly selected hose minimizes the risk of leaks, pressure drops, and localized overheating, which can lead to cylinder head gasket damage or deformation of aluminum components.

This item from the Cooling system hoses and pipes category is essential wherever a stable connection between system ports is required, resistant to temperature changes and vibrations generated by a working diesel engine.

Advantages of using an original BMW hose

Choosing an original radiator coolant water hose for the BMW E46 M47N allows you to maintain the factory characteristics of the cooling system. The most important benefits include:

• precise fit to the ports and routing in the engine bay,
• properly selected hose flexibility, reducing stress on the connections,
• compatibility with factory clamps and mounting brackets,
• preservation of the coolant flow designed by the manufacturer.

Thanks to this, installation is efficient, and the risk of leaks after replacement is reduced compared to generic aftermarket alternatives with uncertain geometry.

Product characteristics and condition

The offered BMW radiator coolant water hose comes from dismantling, which allows for an economical replacement of the component while maintaining the original manufacturer's specifications. A used component of this type is a popular choice for servicing older E46 models, where a reasonable repair cost is important while maintaining compliance with the factory design.

In practice, this means the ability to restore the proper operation of the cooling system without the need to interfere with other sub-assemblies, provided that other elements – such as the radiator, thermostat, or water pump – are in good working order.

Installation and maintenance tips

When replacing the radiator coolant water hose in a BMW E46 M47N, it is worth paying attention to a few technical aspects:

• checking the condition of the ports on the radiator and engine for corrosion and damage,
• replacing or thoroughly inspecting the clamping rings,
• bleeding the cooling system after installation,
• using coolant with parameters consistent with the vehicle manufacturer's recommendations.

This approach allows you to fully utilize the potential of the installed hose and maintain a stable operating temperature of the power unit under various load conditions.

Cooling system service expansion

If you are planning a comprehensive repair or upgrade of the cooling system area in your BMW and need other elements from the same group, such as additional pipes, return hoses, or connecting sections to the heater core, check the available parts in the BMW cooling system hoses and pipes category.

To better plan your service and understand the impact of individual components on the durability of the power unit, it is worth reading the guide on our blog: Engine cooling system – overheating, repair, and used radiators. This will make it easier to assess when a radiator coolant water hose replacement should be combined with additional preventive work.