Mercedes W212 Coolant Expansion Tank Cooling Fluid Bottle Reservoir A2045000849

Mercedes W212 Coolant Expansion Tank A2045000849 is an original cooling system component from the Mercedes group, designed for use in W212 series models. It ensures stable operation of the cooling system by maintaining the correct fluid level and allowing for safe compensation during temperature changes.

Specifications and technical data

• SKU: A2045000849
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2045000849
• Substitutable numbers: A2045000849, A 204 500 08 49, A 212 500 02 49, A2125000249
• Category: Expansion & Overflow Tanks

Function and Role in the Cooling System

The expansion tank in the cooling system is responsible for compensating for fluid volume changes during engine heating and cooling, as well as maintaining stable operating pressure. For the W212 series, a properly functioning tank translates to uniform engine cooling, reduced risk of overheating, and protection of other system components.

A correctly selected expansion tank minimizes the risk of air entering the system, facilitates fluid level checks, and allows for quick detection of any leaks. Replacing a worn-out part with an original component from the same product line helps maintain the cooling system's factory operating parameters.

Compatibility and Technical Specifications

The presented tank belongs to the Expansion Tanks category and has been designed according to Mercedes vehicle manufacturer standards. Technical part markings, including the OEM part number and available replacement numbers, allow for precise verification of compatibility with the specific engine version and model year of the car.

The presence of reference numbers makes it easy to compare with the currently installed part, reducing the risk of selecting the wrong component. If in doubt, it is advisable to cross-reference the markings with the vehicle's service documentation or the manufacturer's catalog.

Part Condition and Benefits of Choosing a Used Component

The offered tank comes from the secondary market, allowing for economical repair of the cooling system while maintaining the original manufacturer's specifications. Choosing a used OEM part is particularly beneficial for vehicles used intensively, where both technical compatibility and reasonable service costs are important.

Using original parts from disassembly also supports an operational model based on part reuse, reducing waste and resource consumption. This is a solution that combines technical aspects with a sensible approach to budget and the environment.

Why Choose an Original Mercedes Expansion Tank

Compared to aftermarket alternatives of unknown origin, an original expansion tank ensures predictable material behavior at high temperatures, adequate pressure resistance, and a perfect fit for factory mounts and hoses. This translates to a lower risk of leaks, easier installation, and stable system operation in the long run.

If you want to consistently maintain your car to manufacturer standards, choosing an original component from the same product line is a solution consistent with service recommendations and the practice of professional workshops.

System Expansion and Related Components

When planning maintenance work, it is worth considering checking hoses, clamps, and the tank cap to comprehensively assess the condition of the entire cooling circuit. In case of operation in harsh conditions or after engine overheating, a review of the entire system helps reduce the risk of further failures and leaks.

If you are interested in other parts from the expansion tanks category for this brand, check the available parts in the Mercedes Expansion Tanks category.

For drivers who want to better understand the benefits of choosing parts from disassembly and the impact of such a decision on the environment and operating costs, we have prepared practical material – find more information in the article Circular Economy in Your Garage – How Choosing Used Parts from Disassembly Truly Supports Environmental Protection and Your Wallet?.