Expansion Tank Mercedes W204 W212 W218 Coolant Reservoir Bottle A2045000949

Expansion Tank Mercedes W204 W212 W218 Coolant Reservoir Bottle is an original cooling system component from the Expansion tanks group, sourced from a Mercedes vehicle. The product ensures stable operation of the cooling system by maintaining the correct fluid level and allowing for compensation during temperature fluctuations.

Specifications and technical data

• SKU: A2045000949
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2045000949
• Substitutable numbers: A2045000949, A 204 500 09 49, A0005840807, A 000 584 08 07
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The presented expansion tank is a component designed for use in the cooling system, where it is responsible for the safe discharge of excess fluid and the compensation of its volume. This allows the system to maintain stable operating pressure, which reduces the risk of engine overheating and the formation of air pockets.

A solution of this type is particularly important in vehicles operated under varying load and temperature conditions, as it allows for maintaining an adequate coolant reserve and facilitates level monitoring during service.

Technical characteristics and fitment

The tank belongs to the Expansion tanks group, which means it has been designed to work with the factory cooling system, maintaining the correct shape, port placement, and mounting points. The design is intended for installation in the engine bay, in the factory location, without the need for modifications to the vehicle's installation.

The component features dedicated connections for coolant hoses and a seat for a pressure cap (selected separately if not included in the set), which enables the maintenance of proper operating pressure throughout the system. By adhering to the manufacturer's standards, it is possible to use existing brackets and hose routings, which facilitates installation and subsequent maintenance.

Product condition and practical aspects

The offered expansion tank is a used component, which in practice means it has been removed from a vehicle and verified for suitability for further use. This type of part is a good solution for users looking for a cost-effective way to restore the efficiency of the cooling system while maintaining the original manufacturer's specifications.

Using an original component from a Mercedes vehicle allows for maintaining factory operating parameters while reducing the risk of fitment issues that may occur with aftermarket replacements featuring imprecise dimensions or different port layouts.

Benefits of using an original expansion tank

• Maintaining stable pressure in the cooling system and reducing the risk of engine overheating.
• Factory fitment to the intended mounting location and existing coolant hoses.
• Possibility of visual fluid level monitoring and faster diagnostics of potential leaks.
• Reasonable repair cost due to the use of a used, original component.

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, return hoses, or mounting hardware, check the available parts in the Mercedes Expansion tanks category.

Additional technical support and part selection

When selecting cooling system components, it is worth paying attention to compatibility with the specific engine version and vehicle model year. In case of doubts regarding compatibility or cooling system configuration, technical materials and installation checklists can be helpful. For users interested in in-depth knowledge about selecting components for modern turbocharged units, the Global Parts guide will be useful – BMW B58 code, or 340 HP from the secondary market – a checklist before buying a turbocharger and intercooler for the BMW 3 Series (G20), which shows how to approach the verification of compatibility and OEM markings in practice step by step.