Mercedes W205 W232 W257 W447 Coolant Expansion Tank Bottle Reservoir A2225000549

Mercedes W205 W232 W257 W447 Coolant Expansion Tank Bottle Reservoir is an original cooling system component, designed for precise integration with factory Mercedes parts. Thanks to its OEM-compliant design, it ensures stable maintenance of pressure and coolant levels, which translates into safe engine operation under various operating conditions. This is a solution for users who expect consistency with factory specifications and predictable cooling system performance.

Specifications and technical data

• SKU: A2225000549-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2225000549
• Substitutable numbers: A2225000549, A 222 500 05 49
• Part type: Coolant Expansion Tank
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The presented expansion tank is a cooling system component responsible for compensating for fluid volume changes and stabilizing operating pressure. In Mercedes W205, W232, W257, and W447 class vehicles, a correctly selected expansion tank is crucial for:

• maintaining the proper coolant level throughout the entire operating temperature range,
• preventing air locks in the system,
• discharging excess fluid during pressure increases,
• maintaining a uniform engine temperature. Due to its design consistent with Mercedes factory standards, the tank works with the existing installation without the need for modifications, which promotes stable and predictable cooling system operation.

Construction and fitment for Mercedes

The expansion tank has been designed as a component dedicated to specific Mercedes models, which translates into the correct placement of ports, mounting points, and connections. This solution ensures:

• proper routing of coolant hoses,
• consistent positioning relative to the radiator and other components,
• easy service access during fluid level checks,
• compatibility with factory sensors and equipment (if present in the vehicle's specific configuration). The original Mercedes origin means maintaining the geometry and operating parameters in accordance with the manufacturer's requirements, which is particularly important in modern high-power-density engines.

Performance characteristics and installation benefits

As a component in the Expansion Tanks category, this product is intended for operation under variable thermal and pressure loads. A properly selected expansion tank contributes to:

• reducing the risk of engine overheating,
• limiting coolant loss,
• easier diagnosis of potential leaks (visual level check),
• maintaining proper fluid circulation throughout the system. The used condition element is a cost-effective solution for users who want to restore the efficiency of the cooling system while maintaining compliance with the factory design. Installing it in place of a worn or damaged tank allows for the restoration of correct operating parameters without interfering with other components.

Selection, identification, and vehicle integration

To ensure full compatibility with a specific equipment version, it is worth verifying part markings and interchangeable numbers in the vehicle's service documentation before purchasing. The product has assigned identifiers, such as SKU, OEM Part Number, and available interchangeable numbers, which facilitates precise matching to a given Mercedes vehicle. The manufacturer information, marked as Brand, confirms its belonging to the Mercedes group, and the Condition parameter allows you to consciously assess the nature of the offered item. If you are planning a comprehensive repair or upgrade of the cooling system area in your Mercedes and need other items from the same group, such as additional tanks, mounting elements, or caps, check out the available parts in the Mercedes Expansion Tanks category.

Service recommendations and additional support

When replacing the expansion tank, it is recommended to simultaneously check the condition of hoses, clamps, and the quality of the coolant itself. Proper bleeding of the system after installation has a direct impact on the durability of the engine and the stability of the operating temperature. In the case of more extensive work on the drivetrain, especially when the intervention also involves the engine unit, it is worth expanding your knowledge of good service practices – the article Buying a used engine: 5 things you must check before installation, which discusses key verification stages for components before installation, may be helpful. By choosing the Mercedes W205 W232 W257 W447 Coolant Expansion Tank Bottle Reservoir, you are opting for a solution consistent with the factory cooling system concept, which helps maintain stable vehicle operating parameters and reduces the risk of unforeseen failures related to engine overheating.