Mini F54 F55 F56 F57 Cooper S JCW Coolant Auxiliary Radiator Cooler 2.0 7643780

Mini F54 F55 F56 F57 Cooper S JCW Coolant Auxiliary Radiator Cooler 2.0 is an original cooling system component from the Water radiators group, designed for Mini models with a 2.0 engine in Cooper S and JCW versions. This used auxiliary radiator allows for a technically correct and cost-effective repair of the cooling system while maintaining the factory engine performance characteristics.

Specifications and technical data

• SKU: 7643780
• Mark: Mini (Genuine OE)
• Condition: Used
• OEM Part Number: 7643780
• Substitutable numbers: 7643780, 17117643780
• Part type: Radiator
• Category: Radiators

Purpose and function in the cooling system

The presented auxiliary coolant radiator is designed as an additional heat exchanger for the sporty Mini Cooper S and JCW variants in F54, F55, F56, and F57 body styles. Its task is to relieve the main water radiator by increasing the heat dissipation surface, which stabilizes the operating temperature of the 2.0 engine during dynamic driving, high loads, and in urban conditions.

Thanks to the original Mini design, the coolant flow is optimized for the stock system, which helps maintain the proper operating temperature and reduces the risk of engine overheating. This is particularly important in the more powerful Cooper S and JCW versions, where the cooling system operates under higher thermal stress.

Benefits of using an original auxiliary radiator

Using a factory auxiliary coolant radiator in a Mini provides a number of practical operational benefits:

• maintaining factory cooling parameters for the 2.0 engine in Cooper S / JCW versions,
• consistency with the original mounting system and hose routing,
• no need for modifications to the installation when the correct model is selected,
• better temperature control during intensive vehicle use.

The original element from the Water radiators group is designed for long-term operation in demanding conditions, which translates into thermal stability of the engine and predictable vehicle behavior across a wide range of loads.

Installation characteristics and fitment

The auxiliary coolant radiator for the Mini F54, F55, F56, F57 is constructed to work with factory mounting points and the stock cooling hose system. As a result, installation in a correctly matched vehicle model is straightforward and does not require body structure adaptations or interference with the basic cooling system architecture.

The used component allows for restoring system efficiency in the event of damage to the existing radiator, e.g., after a collision or overheating, while maintaining a favorable cost-to-functionality ratio. Proper fitment to the specific Mini body and engine version is crucial for correct fluid flow and effective heat dissipation.

Component condition and service application

The auxiliary radiator is offered as a used part, making it an attractive solution for workshops specializing in Mini service and for conscious users looking for a reasonably priced alternative to new components. With proper diagnostics of the entire cooling system, it can be an essential part of a comprehensive repair, including fluid replacement, hose inspection, and leak verification.

Choosing an original Mini component helps maintain the technical integrity of the vehicle, which is important both for engine durability and for the future resale of the car, where compliance with factory specifications matters.

Technical support and additional materials

If you are planning a comprehensive repair or upgrade of the engine area in your Mini and need other elements from the same group, such as additional heat exchangers, cooling modules, or other water radiators, check the available parts in the Mini Water radiators category.

To better understand how high temperatures and summer loads affect the cooling system and when it is worth reaching for used components such as radiators and fans, read our guide: Summer heat vs. cooling system: used radiators and fans as a guarantee of savings.