Mercedes W447 Expansion Tank Coolant Reservoir Bottle A4475000049

Mercedes W447 Expansion Tank Coolant Reservoir Bottle is a factory cooling system component designed for Mercedes W447 series models. It is responsible for maintaining a stable coolant level, which translates into safe engine operation and reduces the risk of overheating. This is a solution for users looking for a proven component with a design that meets the manufacturer's standards.

Specifications and technical data

• SKU: A4475000049
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A4475000049
• Substitutable numbers: A4475000049, A 447 500 00 49
• Category: Expansion & Overflow Tanks

Purpose and function in the cooling system

The expansion tank in the Mercedes W447 plays a key role in compensating for changes in coolant volume during the heating and cooling of the engine unit. A properly selected reservoir ensures:

• maintenance of stable pressure in the cooling system,
• coolant level monitoring during operation,
• proper discharge of excess fluid and air from the circuit.

Thanks to a design consistent with factory solutions, the cooling system maintains its designed operating parameters, which promotes the durability of the engine and its accessories.

Construction and fitment for Mercedes W447

Mercedes W447 Expansion Tank Coolant Reservoir Bottle is designed for the specific mounting points and hose routing in the engine bay of W447 models. The proper shaping of the connectors and the housing facilitates installation and minimizes the risk of leaks resulting from stress or twisted hoses.

The original geometry of the tank allows for the correct positioning of the cap, hoses, and sensors (if provided in the specific vehicle configuration), which promotes trouble-free maintenance and fluid level checks during inspections.

Benefits of using an original reservoir

Choosing an expansion tank dedicated to the Mercedes W447 is a solution that technically supports the proper operation of the entire cooling system. The most important advantages include:

• Structural compatibility – fitment to the factory layout of components in the engine bay,
• preservation of designed pressure and fluid circulation parameters,
• reduction of the risk of leaks resulting from the use of ill-fitting replacements,
• easier diagnostics of potential future faults due to compliance with manufacturer solutions.

For users who operate their vehicle intensively or in varying temperature conditions, a properly selected expansion tank is an essential element of preventive maintenance.

Component condition and service application

The offered tank comes from a group of used parts, which allows for economical repair while maintaining the original design. This type of component is particularly useful in cases of:

• mechanical damage to the existing tank (cracks, abrasions, deformations),
• detected leaks within the housing or connectors,
• preventive maintenance after a cooling system failure.

Using parts from the same model group allows you to maintain the technical integrity of the cooling system without the need for installation modifications.

Expanding Mercedes cooling system service

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, auxiliary elements, or related components, check the available parts in the Mercedes expansion tanks category.