Mercedes W221 Vent Hose Engine Coolant Valve Tank Bleed Pipe Line A2215011725

Mercedes W221 Vent Hose Engine Coolant Valve Tank Bleed Pipe Line is an original cooling system component designed for precise air evacuation from the coolant circuit. Thanks to its factory geometry and perfect fit for the W221 body, it ensures stable cooling system operation and reduces the risk of engine overheating. This solution is particularly beneficial for servicing vehicles used both in city traffic and on long-distance routes.

Specifications and technical data

• SKU: A2215011725
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2215011725
• Substitutable numbers: A2215011725, A 221 501 17 25
• Fuel type: Petrol, Diesel
• Category: Hoses, Lines & Pipes

Purpose and function in the cooling system

The radiator vent hose in the Mercedes W221 model is responsible for the controlled removal of air bubbles from the coolant circuit. A properly functioning hose:

• facilitates maintaining a stable operating temperature of the engine,
• reduces the risk of localized overheating in the cylinder head and radiator area,
• supports uniform fluid circulation throughout the entire system,
• ensures correct compatibility with other cooling system pipes, hoses, and tubes.

As a result, the cooling system maintains proper efficiency both under high-load conditions and during relaxed driving.

Compatibility with petrol and diesel engines

The component has been designed to work in vehicles with various types of engines, which allows it to be used in a wide range of engine configurations in the W221 body. The cooling system in petrol and diesel versions operates under different thermal conditions, which is why a properly selected vent hose:

• ensures proper resistance to temperature and pressure changes,
• maintains the tightness of connections with radiator ports and other pipes,
• minimizes the risk of leaks in the long term of operation.

This is a practical service solution for users who expect consistency with the factory cooling system design.

Characteristics of the used component

The offered hose belongs to the Pipes, hoses, and tubes category and comes from dismantling, which allows maintaining compliance with the original manufacturer's specification. A used component of this type is particularly attractive in situations where:

• a quick replacement of a damaged hose is necessary without interfering with the system's design,
• maintaining the original routing of hoses in the engine bay is important,
• optimizing repair costs while maintaining factory fitment is a priority.

Choosing an original, used hose allows for maintaining consistency with other cooling system components, without the need for adapting aftermarket replacements.

Benefits of using the original vent hose

Using a radiator vent hose dedicated to the Mercedes W221 translates into a number of practical operational benefits:

• preservation of the factory routing of hoses in the engine bay,
• reduction of the risk of system airlocks after coolant replacement,
• better compatibility with original clamps and connectors,
• increased predictability of system behavior under high thermal load conditions.

For workshops and users, this means a more predictable cooling system bleeding process and a lower risk of recurring issues related to improper fluid circulation.

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 pipes, flexible hoses, or rigid tubes, check the available parts in the Mercedes pipes, hoses, and tubes category.

If you are interested in a broader context of selecting used components and want to better plan your car's service in terms of quality and costs, it is worth reading the guide: Used car parts – a way for style and savings.