Water Pump BMW E70 E90 E92 F10 F25 N54 N55 Additional Auxiliary Cooling 9455978

Water Pump BMW E70 E90 E92 F10 F25 N54 N55 Additional Auxiliary Cooling is an original component from the Water pumps group, designed for BMW petrol engines. This used pump provides a functional solution for drivers looking to restore the efficiency of the cooling system while maintaining the factory operating characteristics of the engine.

Specifications and technical data

• SKU: 9455978
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9455978
• Substitutable numbers: 11519455978, 9455978
• Fuel type: Petrol
• Category: Water Pumps

Purpose and function in the cooling system

The presented water pump has been designed to work with BMW N-series petrol engines, used in models such as the X5 E70, E90, and F10. It is responsible for the forced circulation of coolant through the engine block and radiator, which helps maintain a stable operating temperature for the engine, reduces the risk of overheating, and ensures consistent performance during both city and highway driving.

Thanks to its factory design, the pump works seamlessly with original engine accessories, maintaining the correct coolant flow characteristics and compatibility with the control system intended for petrol units.

Benefits of using an original BMW pump

Using an original water pump in a BMW petrol engine allows you to maintain cooling system performance parameters in accordance with the manufacturer's specifications. This is particularly important in N54, N45, and N55 units, which operate under higher thermal loads and require stable heat dissipation.

• factory fit for the cooling system and engine accessories,
• preservation of the manufacturer-intended coolant flow characteristics,
• consistency with the engine control system for petrol versions,
• suitable for installation as a replacement part for a worn-out pump.

For users who prioritize maintaining the original vehicle configuration, choosing this pump is a practical way to ensure predictable engine behavior and proper cooling system operation.

Condition, installation, and compatibility

The pump comes from dismantling and is offered as a used part, allowing for an economical repair while adhering to the original manufacturer's specifications. Before installation, it is recommended to perform a standard check of the cooling system for leaks, inspect the hoses, and properly bleed the system after refilling with fresh coolant.

To select the correct pump model for a specific BMW, it is advisable to use the OEM part number or interchangeable numbers found in the technical specifications, as well as vehicle data (model, generation, petrol engine type). This approach minimizes the risk of incompatibility and speeds up the service process.

BMW Water pumps – expansion and modernization of the cooling system

If you are planning a comprehensive repair or modernization of the engine area in your BMW and need other components from the same group, such as additional pumps, housings, or mounting elements, check out the available parts in the BMW Water pumps category.

Technical support and service knowledge

When working with petrol units, it is worth noting the connection between the cooling system and the fuel supply system, especially in high-power engines. For users who want to better understand the relationships between pumps, injectors, and other fuel system components, our guide article "Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration" will be helpful, as it covers diagnostics, part number selection, and operating principles.

If your BMW belongs to the years often referred to as youngtimers and you are planning a gradual restoration using dismantled parts, you may find inspiration in our post "The second life of a youngtimer – how used car parts rejuvenate cars from 1998–2012", which describes practical modernization scenarios using used components.