BMW E90 E91 E92 LCI N47N Engine Radiator Upper Coolant Hose 8511623

BMW E90 E91 E92 LCI N47N Engine Radiator Upper Coolant Hose is an original, used upper engine coolant hose designed for BMW 3 Series E90, E91, and E92 LCI (facelift) models equipped with the N47N engine. This component belongs to the Lines, Hoses, and Pipes category and serves as a critical connection between the engine and the radiator, ensuring stable coolant flow in the upper part of the circuit. Thanks to its factory geometry and precise connector diameters, the hose ensures a perfect fit with the original radiator and engine ports.

Specifications and technical data

• SKU: 8511623-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8511623
• Substitutable numbers: 17128511623, 8511623, 17124736985, 4736985
• Category: Hoses, Lines & Pipes

Purpose and function in the cooling system

The upper radiator hose in the N47N engine is responsible for transporting heated coolant from the engine unit to the radiator, where it is cooled down. The proper stiffness and flexibility of the hose walls reduce the risk of kinking during temperature fluctuations and thermal stress, which translates into stable operation of the entire cooling system. By maintaining its factory shape, the hose ensures correct routing within the engine bay, minimizing the risk of rubbing against other components and unwanted contact with hot parts. This is particularly important in the tightly packed engine bay of the BMW 3 Series, where every component has a precisely designed path.

Benefits of using an original BMW hose

Using an original hose from the Lines, Hoses, and Pipes category instead of an aftermarket replacement allows you to maintain factory flow and sealing parameters. The properly selected inner diameter and profiled hose sections contribute to:

• stable cooling system pressure under high engine loads,
• reduction of local material stress and the risk of cracks,
• proper venting of the upper part of the cooling circuit. The original component is designed for long-term operation at elevated temperatures, which is especially important in diesel units such as the N47N. The used OEM hose retains its factory geometry and mounting method, which facilitates installation and reduces the time required for replacement.

Selection and compatibility with the N47N engine system

The hose has been designed specifically for use with the N47N engine in E90, E91, and E92 LCI body styles, ensuring compatibility with original ports, clamps, and guide brackets. As a result, the mechanic does not need to modify the hose routing or use additional adapters, and the installation process is predictable and repeatable. The component has assigned part numbers and interchangeable numbers, which facilitates verification of compatibility with a specific vehicle configuration in BMW catalogs and service systems. This is particularly important when selecting components for cars after modifications or with different cooling equipment variants.

Condition, inspection, and preparation for installation

The hose is offered as a used original BMW component, which allows you to combine reasonable costs with the preservation of factory specifications. Before installation, it is recommended to perform a standard visual inspection for any signs of operational wear, such as surface micro-cracks or excessive rubber hardening, as well as to verify the seats for the clamps. In practice, installation is limited to removing the old hose, cleaning the ports, and installing the new component using appropriate clamps. Thanks to its factory shape and length, the hose fits into the engine bay exactly as intended by the manufacturer, which promotes trouble-free operation after replacement.

Expanding the cooling system in the BMW 3 Series

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 rigid fluid pipes, check out the available parts in the BMW Lines, Hoses, and Pipes category. For drivers who are also considering repairs within the drivetrain and want to make informed choices about component selection, an article explaining when original used parts are more cost-effective than remanufacturing may be helpful – more information can be found in the material Manual transmission failures – why an original used part is a more sensible choice than remanufacturing.