BMW 1 Series E87 120d M47N2 Radiator Automatic Gearbox Oil Hose Pipe 7789585

BMW 1 Series E87 120d M47N2 Radiator Automatic Gearbox Oil Hose Pipe is an original cooling system component designed for BMW 1 Series models with an automatic transmission. Thanks to its factory geometry and precisely selected diameter, it ensures stable coolant return and proper circulation throughout the entire system. This is a practical solution for users who want to restore full radiator efficiency while maintaining factory engine operating parameters.

Specifications and technical data

• SKU: 7789585
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7789585
• Substitutable numbers: 7789585, 17127789585
• Gearbox type: Automatic
• Category: Hoses, Lines & Pipes

Purpose and function in the cooling system

The presented radiator return hose is a component responsible for discharging cooled fluid from the radiator back into the engine circuit. The correct shape and internal diameter ensure:

• maintaining proper coolant flow under engine load,
• stabilization of the engine's operating temperature under typical operating conditions,
• proper cooperation with the factory radiator and other system hoses.

By being matched to a specific drivetrain configuration, the hose works with the engine accessories and the engine bay layout in the BMW E87 120d, minimizing the risk of collision with other components.

Compatibility with automatic transmission

The element has been designed for vehicles equipped with an automatic transmission, which is significant for the routing of hoses and the placement of components in the engine bay. The appropriate profiling allows for:

• collision-free hose routing relative to the transmission housing and hydraulic lines,
• maintaining required clearances from heat-generating elements,
• easier installation without the need to modify factory mounts.

Such a fit reduces material stress during system operation and promotes longer, stable service life.

Characteristics of the original BMW part

As a part from the Lines, hoses and pipes group originating from the BMW OE line, the hose maintains factory standards of construction and geometry. This means, among other things:

• compliance with original mounting points on the body and radiator,
• properly selected material flexibility, facilitating installation and vibration compensation,
• adaptation to work within typical temperature and pressure ranges of the BMW cooling system.

The used OEM component is a solution that allows you to maintain the integrity of the entire cooling system without the need to use replacements with uncertain geometry.

Condition, installation and service application

The part is offered as used, which makes it a reasonable option for maintenance repairs, such as replacing a damaged or leaking return hose. In practice, this means the possibility of:

• restoring the tightness of the cooling system after the old hose cracks or perishes,
• reducing repair costs while maintaining the original specification,
• use as part of a comprehensive cooling system service, including fluid replacement and radiator inspection.

Before installation, it is recommended to perform a standard inspection of the connection surfaces, clamps, and sockets on the radiator and engine to ensure even tightening and connection tightness.

Support with selection and further system expansion

If you are planning a broader cooling system service or need other elements from the lines and hoses group, it is worth browsing the full offer in the Lines, hoses and pipes category to select components that are structurally compatible with your BMW. In the case of extensive BMW unit upgrades, helpful materials such as the checklist before purchasing accessories for more powerful BMW units may be useful, which show good practices in terms of part selection, OEM verification, and checking compatibility by VIN.

For users who focus on conscious service, additional support in component selection and work planning can be found in the practical Global Parts guide to diagnostics and modernization of systems in BMW, facilitating the assessment of the condition of existing elements and planning subsequent stages of repair.