Mercedes W205 Radiator Expansion Overflow Reservoir Tank Bottle A2055000549

The Mercedes W205 Coolant Expansion Tank is a cooling system component designed for C-Class W205 generation models, ensuring stable engine operation across a wide temperature range. This genuine Mercedes expansion tank from the Expansion Tanks category is engineered to work with the factory cooling system and maintain manufacturer-specified parameters. A used OEM component is a sensible choice for drivers who expect factory fitment and predictable cooling system performance.

Specifications and technical data

• SKU: A2055000549
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2055000549
• Substitutable numbers: A2055000549, A 205 500 05 49
• Category: Expansion & Overflow Tanks

Application and Function in the Cooling System

The presented tank serves as a coolant reservoir, compensating for fluid volume changes as the engine heats up and cools down. A correctly chosen component from this group allows you to:

• maintain a stable coolant level in the system,
• minimize the risk of air ingress into the circuit,
• ensure proper operating pressure in the system,
• facilitate visual coolant level checks.

Thanks to its design that meets manufacturer requirements, the tank integrates with factory hoses, spigots, and sensors, reducing the need for any modifications during installation.

Original Origin and OEM Compliance

As a genuine Mercedes-Benz part, the expansion tank has been specifically designed for the engine bay geometry of W205 models. This ensures:

• factory mounting points,
• correct positioning of connection spigots,
• compatibility with the original cap and accessories.

Using OEM components in the cooling system is particularly important as it affects engine durability, uniform heat dissipation, and proper interaction with other components such as the radiator, water pump, or thermostat.

Used Condition and Benefits of Choosing OEM Parts

The offered tank comes from the secondary market, allowing for savings while maintaining factory specifications. Compared to low-cost aftermarket alternatives, a used OEM part typically better replicates:

• precision fit with the body and accessories,
• material resistance to temperature and pressure,
• dimensional stability over a longer service life.

If you want to learn more about the advantages of genuine used parts, it's worth reading our expert material – why used genuine OEM parts are a safe and economical choice.

Why Install This Expansion Tank in a Mercedes W205

Installing an OEM expansion tank in a Mercedes W205 is a way to maintain the cooling system's operating parameters as intended by the manufacturer without the need for costly replacement of all accessories. For workshops and individual users, this means:

• easier installation due to factory fitment,
• reduced risk of leaks resulting from imprecise aftermarket parts,
• maintenance of the vehicle's original configuration.

If you need other parts from this group dedicated to this brand, for example, for comprehensive cooling system service, check the available parts in the Mercedes Expansion Tanks category.

Summary

The Mercedes W205 Coolant Expansion Tank is a practical solution for users who want to restore proper cooling system function while adhering to manufacturer standards. Its genuine origin, precise fit for the W205 design, and its role in stabilizing coolant level and pressure make it a sensible choice for repairs and maintenance of the cooling system in Mercedes cars of this generation.