BMW E46 E87 E90 E91 Petrol N42 N45 N46 Cooling System Radiator Water Hose Pipe

BMW E46 E87 E90 E91 Petrol N42 N45 N46 Cooling System Radiator Water Hose Pipe is an original cooling system component from the Hoses, pipes and lines group, designed for BMW petrol engines. This used OEM part ensures factory-fit, stable coolant flow, and predictable performance under operating conditions typical for N-series units.

Specifications and technical data

• SKU: 7572158
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7572158
• Substitutable numbers: 11537572158, 7572158, 11537501427, 7501427
• Fuel type: Petrol
• Category: Hoses, Lines & Pipes

Purpose and function in the cooling system

This water hose operates within the coolant circuit of petrol engines, responsible for the controlled flow of the medium between system components. A correctly selected hose minimizes the risk of localized overheating, supports a stable engine operating temperature, and helps maintain even thermal load on the cylinder head and block.

Thanks to a design compliant with the manufacturer's standards, the hose maintains proper geometry under load, which limits wall collapse during pressure changes and facilitates correct routing in the engine bay without interference with other components.

Benefits of using an original BMW hose

Using an original water hose instead of universal parts or low-budget replacements offers a number of practical benefits:

• factory-fit for N-family petrol engine cooling systems, with no modifications required,
• stable coolant flow within typical temperature and pressure ranges,
• reduced risk of leaks resulting from imprecise fitting of connectors and clamps,
• easier cooling system diagnostics thanks to the original hose routing.

A used OEM part is a reasonable compromise between cost and quality – it allows you to maintain the integrity of the cooling system according to factory specifications, which is especially important in engines sensitive to overheating.

Selection and installation of the water hose

Before installation, it is recommended to verify the compatibility of the hose with the specific engine version and cooling system of your BMW. In practice, this means checking the hose routing, connection diameters, and the method of attachment in the engine bay brackets and guides.

During installation, it is worth paying attention to:

• the condition of the connectors and sealing surfaces on adjacent system components,
• the selection of appropriate hose clamps with the correct clamping force range,
• proper bleeding of the cooling system after replacing the hose,
• leak testing after reaching the engine's operating temperature.

Such an approach limits the risk of secondary leaks and allows you to fully utilize the functionality of the water hose in daily operation.

Application in BMW petrol vehicles

The hose has been designed with petrol units in mind, which means it is matched to the thermal and pressure characteristics typical for this type of engine. In practice, this translates into appropriately selected material flexibility, resistance to temperature changes, and compatibility with coolants used by the manufacturer.

For users planning more extensive cooling system maintenance – e.g., replacing several pipes, lines, or hoses in one service stage – the consistency of the components used with factory specifications is crucial for long-term reliability.

Expanding service within the BMW cooling system

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 water pipes, flexible cooling hoses, or rigid coolant lines, check the available parts in the BMW Hoses, pipes and lines category.

For drivers interested in a broader approach to used components and optimizing operating costs, practical tips on part selection and common faults can be found in the article: Used car parts for Mini Cooper – a way for style and savings.