Expansion Tank BMW F20 F21 F30 F31 Radiator Bottle 7609468

Visual condition of the part

The product shows signs of use visible in the photos.

Expansion Tank BMW F20 F21 F30 F31 Radiator Bottle is an original cooling system component from the Expansion tanks group, designed for installation in selected BMW F-series models. This used OEM component ensures factory-fit, stable cooling system operation, and predictable engine performance across a wide range of loads. It is a practical solution for users who want to restore proper coolant circulation without compromising on compatibility.

Specifications and technical data

• SKU: 7642160-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7642160
• Substitutable numbers: 7642160, 17137642160, 7609468, 17137609468
• Category: Expansion & Overflow Tanks

Function and role in the cooling system

The expansion tank in BMW F-series models is responsible for compensating for changes in coolant volume, stabilizing pressure, and safely discharging excess fluid. A properly selected tank helps maintain a constant operating temperature for the engine, which translates into the longevity of the engine, seals, and other cooling system components.

The original design dedicated to specific BMW models minimizes the risk of leaks, venting issues, and incorrect fluid level readings. As a result, the cooling system operates under stable conditions, and the driver can detect any deviations from the norm more quickly.

Compatibility and fit for BMW

The presented tank has been designed specifically for the BMW F-series platform, including F20, F21, F30, and F32 bodies. This means maintaining factory mounting points, proper hose routing, and the correct positioning of connection ports relative to the rest of the cooling system.

By using an original BMW solution, the user gains:

• certainty of compatibility with the factory cooling installation,
• easier installation without the need for modifications,
• consistency with other system elements, such as hoses and the radiator.

Characteristics of the used OEM element

As a used element, the expansion tank provides an economical alternative to a new part while maintaining the key features of the original BMW component. This type of solution is particularly beneficial for maintenance repairs when the priority is to preserve the factory design of the cooling system at reasonable service costs.

The original BMW OE origin means that the tank was manufactured in accordance with the manufacturer's internal standards, using materials selected for their resistance to temperature, pressure, and long-term contact with coolant.

Practical benefits of installation

Installing an expansion tank dedicated to specific BMW models allows for the restoration of proper cooling system operating parameters after the previous element has been damaged or worn out. A properly selected tank:

• facilitates coolant level monitoring,
• reduces the risk of engine overheating,
• supports pressure stability throughout the entire system.

For workshops and individual users, this means faster diagnostics of potential leaks and a lower risk of complications resulting from the incorrect selection of replacement parts.

Expanding the BMW cooling system – related elements

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 tanks, mounting elements, or related cooling system components, check the available parts in the BMW expansion tanks category.

Technical support and service knowledge

When performing service work on the drivetrain and cooling system, it is worth paying attention to the general condition of components that work with the expansion tank, such as hoses, clamps, or engine control elements. For drivers interested in a broader perspective on the operation of drivetrain components and the selection of used parts, the following guide may be helpful: Transmission: manual, automatic, or DSG – common faults and a guide to buying a used transmission.