Mercedes W204 Coolant Expansion Tank Reservoir Bottle A2045000749

Mercedes W204 Expansion Tank A2045000749 is an original cooling system component from the expansion tanks category, designed for W204 series models. The offered component comes from disassembly, allowing for an economical yet fully functional replacement of a worn-out tank in your Mercedes. This is a solution for users seeking factory fit and proven design without the need to invest in a new part.

Specifications and technical data

• SKU: A2045000749
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2045000749
• Substitutable numbers: A2045000749, A 204 500 07 49
• Category: Expansion & Overflow Tanks

Purpose and Fitment for Mercedes W204

The presented tank has been specifically designed for the W204 platform, ensuring proper hose routing, correct mounting, and compatibility with the original engine bay equipment. The design corresponds to the original solutions used by the manufacturer, which facilitates installation and reduces the risk of leaks in the cooling system.

Choosing an original expansion tank for your Mercedes allows you to maintain the cooling system's operating parameters in line with the manufacturer's specifications, which is important for both engine durability and stable operating temperature.

Technical and Functional Characteristics

As a cooling system component, the expansion tank is responsible for compensating for changes in coolant volume and maintaining the correct fluid level. The tank's design includes:

• a properly shaped working chamber for coolant,
• compatibility with factory hoses and connectors,
• mounting points corresponding to the original W204 installation.

This ensures that replacing a worn-out component with the presented tank is a predictable process, without the need for installation modifications or additional adapters.

Product Condition and Benefits of Using a Used Part

The offered expansion tank is a used part, sourced from vehicle disassembly. This type of component offers a sensible compromise between cost and functionality, especially for daily driven vehicles where maintaining the cooling system's efficiency with controlled service expenses is crucial.

Using an original, used tank allows you to:

• maintain factory fitment with the Mercedes W204 cooling system,
• ensure predictable system behavior under various operating conditions,
• minimize the risk of installation problems typical for aftermarket parts with different geometries.

Practical Application in Service

Replacing the expansion tank is recommended when there are visible signs of wear, cracks, deformations, or problems with maintaining pressure in the cooling system. By installing the expansion tank for Mercedes W204, you restore proper coolant circulation and stable engine operating temperature, which reduces the risk of engine overheating and associated costly repairs.

This component is suitable for both standard maintenance and comprehensive cooling system repairs where maintaining consistency with the vehicle's factory specifications is required.

Other Mercedes Expansion Tanks and Technical Knowledge

If you are also looking for other Mercedes expansion tanks compatible with various models of this brand, check out the Mercedes expansion tanks available in our store to select the appropriate part for your specific engine version and year.

When performing service work on the cooling system and engine, it is also advisable to ensure proper diagnostics of other components. For diesel vehicles, an article discussing the symptoms and consequences of neglecting fuel system components may be helpful, available here: diesel injector faults – how to recognize them and what their neglect entails.