BMW F10 F11 Coolant Hose Engine Cooling Radiator Water Line 525d N47S1 8509102

BMW F10 F11 Coolant Hose Engine Cooling Radiator Water Line 525d N47S1 is an original cooling system component from the Lines, hoses and pipes group, designed for use in the N47S1 power unit. This used OEM component ensures proper coolant flow, stabilizing the engine's operating temperature and supporting its safe, predictable performance.

Specifications and technical data

• SKU: 8509102
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8509102
• Substitutable numbers: 8509102, 17128509102
• Part type: Hose
• Category: Hoses, Lines & Pipes

Purpose and function in the cooling system

The described hose is a cooling system component responsible for the directional flow of fluid between the radiator and the engine in BMW 5 Series F10/F11 models with the 525d N47S1 unit. A correctly selected hose ensures:

• stable coolant flow under typical road loads,
• maintenance of the proper engine operating temperature,
• reduced risk of overheating in city and highway driving conditions,
• consistency with the factory geometry of the BMW cooling system.

Thanks to a design compliant with the manufacturer's specifications, the hose works with factory connectors, clamps, and other system elements, which facilitates installation and reduces the need for additional modifications.

Benefits of using an original BMW hose

Using an original hose from the Lines, hoses and pipes group in a BMW F10/F11 allows you to maintain cooling system performance parameters in line with factory specifications. Key advantages include:

• precise fit of shape and diameters to the engine and radiator factory connectors,
• compatibility with factory brackets and routing in the engine bay,
• preservation of predictable coolant flow characteristics,
• reduced risk of leaks resulting from the use of aftermarket parts with different geometry.

The used OEM component is a cost-effective solution that is technically consistent with the rest of the system, which is essential when servicing BMW diesel engines.

Component condition and installation aspects

The hose is offered as a used part, which in practice means the possibility of an economical cooling system repair while maintaining the original manufacturer's specification. Before installation, a standard visual inspection for any signs of wear is recommended, followed by:

• checking the contact surfaces with the connectors,
• replacing hose clamps with new ones, matched to the hose diameter,
• bleeding the cooling system after refilling with fresh coolant.

This approach allows for maintaining the tightness and proper operation of the system in the long term, without unnecessary service downtime.

Application in service and upgrades

BMW F10 F11 Coolant Hose Engine Cooling Radiator Water Line 525d N47S1 will prove useful both for typical replacement of a worn hose and for broader service work in the engine area, including, for example, replacing the radiator, thermostat, or other coolant hoses. Maintaining a complete, leak-free cooling system is crucial for the durability of the N47S1 unit, especially in heavily used fleet and highway vehicles.

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 return lines, connecting hoses, or coolant pipes, check the available parts in the BMW Lines, hoses and pipes category.

Additional technical support

When planning service work within the cooling system and power unit, it is also worth considering the condition of components responsible for thermal comfort inside the vehicle. Practical tips on selecting used OEM components and maintenance schedules can be found in the article Air conditioning and heating – part selection and maintenance for year-round comfort, which can be a helpful supplement when planning broader service work.