Mercedes W211 W219 Coolant Expansion Tank Bottle A2115000049

Mercedes W211 W219 Coolant Expansion Tank Bottle is an original cooling system component from the Expansion tanks category, designed for Mercedes E-Class W211 and CLS W219 models. It ensures stable operation of the cooling system, allowing for safe coolant volume compensation and level monitoring during vehicle operation.

Specifications and technical data

• SKU: A2115000049
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2115000049
• Substitutable numbers: A2115000049, A 211 500 00 49
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The expansion tank in a Mercedes is responsible for maintaining the proper coolant level and compensating for pressure and temperature changes within the system. A correctly selected component from this group minimizes the risk of engine overheating, facilitates system bleeding, and allows for quick, visual inspection of the fluid level. Thanks to the factory geometry of the mounts and ports, the tank works seamlessly with original hoses and accessories, which translates into stable, predictable operation of the entire cooling system.

Original origin and fitment

The offered tank comes from the Mercedes brand, which means it maintains factory standards for construction, shape, and connection layout. The original design ensures:

• precise fitment to the engine bay in W211 and W219 models,
• proper routing of coolant hoses,
• compatibility with factory sensors and the cooling system cap (if provided in the specific configuration).

As a result, the installation process is straightforward, without the need for modifications to the system or the use of additional adapters.

Performance characteristics and condition

The item comes from the secondary market and is marked as Used, which allows for an economical replacement of the tank while maintaining the manufacturer's original specifications. This type of solution is particularly beneficial when servicing older vehicles, where both technical compliance and reasonable repair costs are important. The tank is designed for installation in place of the factory component, maintaining the serial mounting points and hose routing.

Benefits of using an original expansion tank

Using an original expansion tank in a Mercedes W211 or W219 allows you to maintain the integrity of the entire cooling system. In practice, this means:

• maintaining factory engine operating parameters regarding temperature,
• reducing the risk of leaks resulting from imprecise fitment,
• easier diagnostics of potential cooling system faults,
• no need for system modifications during replacement.

For users who value technical correctness and operational predictability, choosing an original component from the Expansion tanks group is a safe and functional solution.

Part identification and compatibility

The product has an assigned warehouse designation A2115000049 and a factory OEM part number, which facilitates clear identification in service catalogs and when selecting for a specific engine version. Additionally, interchangeable numbers are available, allowing you to verify compatibility with other references used within the same vehicle platform.

If you are planning a comprehensive repair or upgrade of the cooling system area in your Mercedes and need other components from the same group, such as additional tanks, hoses, or mounting elements, check the available parts in the Mercedes Expansion tanks category.

For users who pay attention to environmental aspects and want to consciously choose parts from the secondary market, we recommend the article Sustainable automotive: How purchasing original used parts reduces your carbon footprint and protects the environment?, which explains why used components can be a reasonable alternative to new replacements.