Coolant Radiator BMW F01 LCI F12 640i 740i N55 Engine Cooling Radiator 7605644

Coolant Radiator BMW F01 LCI F12 640i 740i N55 Engine Cooling Radiator is an original cooling system component designed for gasoline vehicles of this series. It ensures stable heat dissipation from the power unit, which translates into a safe engine operating temperature and predictable vehicle behavior in both city traffic and on the highway. Thanks to its design compliant with manufacturer standards, it is a particularly beneficial solution for repairs requiring the maintenance of factory parameters.

Specifications and technical data

• SKU: 8615454
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8615454
• Substitutable numbers: 8615454, 17118615454, 7605644, 17117605644
• Fuel type: Petrol
• Category: Radiators

Purpose and compatibility

The presented radiator is dedicated to BMW F01 LCI and F12 models in 640i and 740i versions with the N55 gasoline engine. Using an original design allows for maintaining proper coolant flow, adequate heat exchange surface, and correct fitment to factory mounts and hoses in the engine bay.

The component belongs to the Water Radiators group, which are key components responsible for maintaining a stable operating temperature of the power unit, directly impacting engine durability, combustion efficiency, and driving comfort.

Construction and function in the cooling system

The coolant radiator in this BMW model operates in a closed circuit with a liquid pump, thermostat, and fan, extracting excess heat from the engine and releasing it into the environment. The design has been engineered to:

• ensure efficient coolant flow under various engine loads,
• maintain a stable operating temperature in city and highway conditions,
• work in conjunction with the cooling system accessories intended for the N55 unit.

A properly selected radiator reduces the risk of overheating, protects seals, the cylinder head, and the turbocharger, and also helps maintain the correct operating parameters of the lubrication and combustion systems.

Benefits of using an original used radiator

Choosing an original BMW water radiator in a used condition is a solution that allows for cost control while maintaining factory geometry and flow parameters. Compared to low-quality replacements, the original component ensures:

• secure fitment to factory brackets and hoses,
• compatibility with the operating characteristics of the N55 engine cooling system,
• maintenance of the cooling efficiency intended by the manufacturer.

A used radiator is a good choice for post-accident repairs, replacement after leaks, or comprehensive cooling system maintenance in intensively used vehicles, where both functionality and a rational service budget are important.

Practical assembly and operational tips

When replacing the radiator in a BMW F01 LCI / F12 640i 740i with an N55 engine, it is worth paying attention to several technical aspects:

• checking the condition of cooling system hoses and clamps,
• verifying the operation of the thermostat and liquid pump,
• properly bleeding the system after installation,
• selecting coolant that complies with the manufacturer's specifications.

This approach allows you to fully utilize the radiator's potential and reduce the risk of needing further cooling system interventions shortly after the repair.

Cooling system expansion and auxiliary materials

If you are planning a comprehensive repair or upgrade of the engine area in your BMW and need other elements from the same group, such as additional radiators, liquid hoses, or expansion tanks, check the available parts in the BMW Water Radiators category.

To better understand how high summer temperatures affect cooling system efficiency and when it is worth reaching for used components, such as radiators and fans, check out the guide Summer heat vs. cooling system: used radiators and fans as a guarantee of savings. This is a practical addition to your knowledge when planning cooling system service for your BMW.