Expansion Tank Mercedes W211 CLS C219 Coolant Overflow Bottle A2115000049

Visual condition of the part

The product shows signs of use visible in the photos.

Expansion Tank Mercedes W211 CLS C219 Coolant Overflow Bottle is an original cooling system component from the Expansion tanks category, designed for Mercedes E-Class W211 and CLS C219 models. This used OEM component ensures proper circulation and compensation of coolant volume, which translates into stable engine operation and safe thermal conditions. It is a solution for users looking for a factory fit without the need to invest in a new part.

Specifications and technical data

• SKU: A2115000049-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2115000049
• Substitutable numbers: A2115000049, A 211 500 00 49
• Category: Expansion & Overflow Tanks

Function and role in the cooling system

The expansion tank in the Mercedes W211 and CLS C219 is responsible for compensating for changes in coolant volume during engine heating and cooling. A properly selected component:

• stabilizes pressure in the cooling system,
• allows for easy coolant level monitoring,
• reduces the risk of engine overheating,
• supports even heat dissipation from the engine.

Thanks to the preservation of factory geometry and connections, the tank works with hoses and other cooling system components without the need for modifications.

Compatibility and fit for Mercedes W211 / CLS C219

The presented tank has been designed with the engine bay architecture of the Mercedes W211 and CLS C219 in mind. This means:

• proper placement of connection ports relative to the radiator and hoses,
• factory mounting points in the chassis,
• maintenance of the correct operating capacity for the cooling system of these models.

Such a fit translates into trouble-free installation and maintenance of the vehicle's original functionality, without interfering with the cooling system design.

Characteristics of the used OEM component

The offered expansion tank is a used part, sourced from a dismantled Mercedes vehicle. In practice, this means:

• preservation of the manufacturer's original specification,
• factory fit for the cooling system,
• more favorable cost compared to a new replacement.

A used OEM component is a good choice in situations where the priority is compliance with the factory design and a rational repair budget. Expansion tanks of this type allow for restoring the proper operation of the cooling system without compromises in terms of fitment.

Practical application and installation benefits

Replacing the expansion tank is recommended in case of visible cracks, leaks, or signs of overheating. Using an original component for the Mercedes W211 / CLS C219 ensures:

• maintenance of the correct coolant level,
• reduction of the risk of system aeration,
• consistency with factory sensors and equipment (if present in the vehicle's specific configuration),
• aesthetic integration into the engine bay, consistent with the manufacturer's design.

For users planning cooling system maintenance, choosing an original tank is a technically safe and predictable solution in operation.

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

New or used part – how to choose?

When selecting an expansion tank for a Mercedes W211 or CLS C219, it is worth consciously comparing the advantages of new and used OEM parts in terms of costs, durability, and fit. It may be helpful to compare typical repair scenarios, differences in build quality, and potential savings when choosing parts from dismantling. To better understand these relationships and choose a solution appropriate for your budget and vehicle usage, read the article New or used? A comparison of costs and quality of car parts.