Mercedes W204 Expansion Tank Bleed Line Pipe Hose A2045012825

Mercedes W204 Expansion Tank Bleed Line Pipe Hose is an original cooling system component, designed specifically for the W204 series models. Thanks to its factory-spec geometry and fitment, it ensures stable air evacuation from the system, which promotes smooth engine operation and reduces the risk of overheating. This is a practical solution for users who want to maintain the structural integrity of the vehicle and use components that comply with Mercedes factory standards.

Specifications and technical data

• SKU: A2045012825
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2045012825
• Substitutable numbers: A2045012825, A 204 501 28 25
• Category: Other Car Parts & Accessories

Function and role in the cooling system

The Mercedes W204 Expansion Tank Bleed Line Pipe Hose is responsible for the controlled removal of air bubbles from the coolant circuit. A properly functioning hose:

• stabilizes pressure in the expansion tank,
• reduces the risk of air locks in the cooling lines,
• supports the maintenance of the correct operating temperature of the engine unit,
• ensures predictable system behavior in both city and highway driving conditions.

Thanks to its fitment for the specific W204 body generation, the hose maintains the correct routing in the engine bay, which facilitates service and minimizes the risk of incorrect installation.

Compatibility and fitment for Mercedes W204

The discussed hose has been developed with the cooling system architecture of the W204 generation Mercedes C-Class in mind. This means that:

• its connection diameters are adapted to the expansion tank ports and other system components,
• the factory shape of the hose allows it to be routed in accordance with the original brackets and mounts,
• compatibility with Mercedes factory design solutions is maintained.

Such fitment translates into trouble-free installation and reduces the need for modifications to other components in the engine bay.

Characteristics of the used component

The Mercedes W204 Expansion Tank Bleed Line Pipe Hose offered as a used part is a cost-effective solution for drivers looking for original components at a reasonable price. A component of this type:

• retains its factory design and flow parameters,
• is selected for compatibility with the Mercedes W204 cooling system,
• allows for maintaining consistency with other installation elements.

For many users, choosing an original used hose is a compromise between quality and cost, while maintaining the manufacturer's specifications.

Service application and user profile

The Mercedes W204 Expansion Tank Bleed Line Pipe Hose is particularly useful in situations where:

• the existing hose shows signs of wear, cracking, or leaks,
• cooling system repairs are being carried out after engine overheating,
• it is necessary to replace several elements associated with the expansion tank.

Choosing an original component allows you to maintain the integrity of the cooling system and reduce the risk of problems resulting from the imprecise fit of universal aftermarket replacements.

Related categories and technical materials

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 hoses, connectors, or small mounting parts, check the available parts in the Other Mercedes category.

For a comparison of technical solutions used in sports versions of other brands and a better understanding of the differences in engine, brake, and chassis design, it is worth reading the guide Audi RS vs other models – what is hidden under the hood and chassis?, which shows how manufacturers design key systems in high-performance cars.