BMW E81 E87 E90 E91 Radiator Hose N47 Cooling Water Pipe 7796871

BMW E81 E87 E90 E91 Radiator Hose N47 Cooling Water Pipe is a component from the Lines, hoses and pipes group, designed for the cooling system in BMW cars with the N47 engine. It is responsible for the stable flow of coolant between the radiator and the engine, which has a direct impact on the operating temperature of the power unit and operational safety.

Specifications and technical data

• SKU: 7796871-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7796871
• Substitutable numbers: 17127796871, 7796871, 17127797259, 7797259
• Category: Hoses, Lines & Pipes

Purpose and function of the BMW N47 radiator hose

The presented radiator hose is designed to work with the cooling system in BMW E81, E87, and E90 series models with the N47 engine. Its task is to maintain a tight, controlled flow of coolant, which reduces the risk of engine overheating, performance loss, and unplanned service downtime. A properly selected water pipe ensures correct circulation of the cooling medium throughout the entire circuit.

Construction and advantages of using an original pipe

The radiator hose in this version belongs to a group of components molded to the specific geometry of the BMW engine bay, thanks to which it maintains the correct routing, does not rub against adjacent components, and is not exposed to excessive stress. Using an original solution from the Lines, hoses and pipes category allows for maintaining factory hose routing and compatibility with the connectors and mounting clamps provided by the manufacturer.

Selecting the right radiator hose is important not only for tightness but also for the thermal stability of the entire system. The appropriate diameter, shape, and flexibility of the hose help to limit local pressure drops of the fluid, and thus support even engine cooling under various load conditions.

Condition, fitment, and service application

The item is offered as a used part, which allows for an economical repair of the cooling system while maintaining the original BMW specification. This type of hose is suitable both for a typical replacement of a worn or leaking hose and for broader service work related to cooling system maintenance, such as replacing the radiator, thermostat, or water pump.

In workshop practice, the use of an original coolant water pipe facilitates installation – the mounting points and the length of the hose are matched to the factory system, which shortens working time and reduces the risk of needing additional modifications.

Benefits of using a dedicated radiator hose

• Maintaining the correct operating temperature of the N47 engine thanks to stable coolant flow.
• Better system tightness compared to universal replacements with imprecise shapes.
• Reduction of the risk of failures resulting from overheating, airlocks, or fluid loss.
• Easier installation thanks to the fitment to the factory hose routing in the BMW E81, E87, and E90 engine bay.

Cooling system expansion and related parts

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

Tips for choosing used components

When selecting used components for the cooling system, it is worth paying attention to the external condition of the hose, the flexibility of the material, and any signs of previous repairs. Used original components often provide a better fit than cheap replacements, which is especially important in the tightly packed engine bays of modern BMWs.

If you are considering broader use of parts from the secondary market – especially in the area of electronics and control – practical advice on assessing their suitability and safety may be helpful. You can find more information in the article The second life of electronics – when is it worth choosing used engine controllers, comfort modules, and parking sensors?.