Tank Mercedes-Benz C CLK Class W203 C209 Coolant Expansion Bottle A2035000049

Tank Mercedes-Benz C CLK Class W203 C209 Coolant Expansion Bottle is an original cooling system component from the Expansion tanks category, designed for Mercedes C-Class W203 generation models. This used OEM part ensures factory-fit, stable cooling system operation, and predictable engine performance across a wide temperature range. It is a practical solution for users looking for a proven part at a reasonable price, while maintaining a design consistent with the manufacturer's factory specifications.

Specifications and technical data

• SKU: A2035000049
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2035000049
• Substitutable numbers: A2035000049, A 203 500 00 49
• Category: Expansion & Overflow Tanks

Function and role in the cooling system

The expansion tank in the Mercedes W203 is responsible for compensating for coolant volume changes, stabilizing pressure, and safely discharging excess fluid. A correctly selected component:

• maintains the proper fluid level throughout the entire cooling system,
• reduces the risk of engine overheating,
• provides visual monitoring of the fluid level,
• supports the uniform operation of the thermostat and radiator.

As a result, the cooling system operates under stable conditions, which translates into engine longevity and predictable performance during daily use.

Compatibility and fit for Mercedes W203

The offered tank has been designed specifically for the Mercedes W203 platform, which means factory mounting points, appropriate connection ports, and compatibility with the original hose layout. The original OEM design eliminates the need for modifications, hose adjustments, or the use of additional adapters.

Thanks to this, installation is predictable, and once installed, the tank works with the other cooling system components in accordance with the vehicle manufacturer's specifications.

Characteristics of the used component

The presented expansion tank is a used part, which in practice represents a favorable compromise between purchase cost and maintaining the manufacturer's original specifications. The used OEM component:

• retains factory geometry and connection layout,
• is matched to the serial brackets and mounts in the engine bay,
• allows for maintaining the integrity of the cooling system without interfering with the car's construction.

This is a particularly attractive solution for maintenance repairs, where the priority is to restore full system functionality while adhering to original technical solutions.

Practical application and benefits of installation

Replacing the expansion tank in a Mercedes W203 is recommended, among other things, in the event of visible cracks, leaks, problems with maintaining fluid levels, or after engine overheating. Using an original tank from the Expansion tanks category allows you to:

• restore proper coolant circulation,
• minimize the risk of system airlocks,
• maintain stable engine operating conditions in city traffic and on the highway,
• ensure compliance with the manufacturer's service documentation.

For workshops and individual users, this means predictable installation and easier diagnostics of potential future faults.

Expanding the cooling system in your Mercedes

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 related system components, check out the available parts in the Mercedes expansion tanks category.

If you are interested in broader use of used OEM components when retrofitting or upgrading your car, it is worth checking out the guide on professional retrofitting – you will find practical tips in the article on retrofitting and upgrading your car with used parts from higher trim levels.