Mercedes W211 C219 Radiator Expansion Tank Top Coolant Hose A2115015082

The Coolant Hose from Expansion Tank to Radiator for Mercedes W211 / C219 is an original cooling system component, specifically designed for E-Class and CLS models. With its factory-set geometry and diameter, it ensures stable coolant flow between the expansion tank and the radiator, supporting proper engine operation and reducing the risk of overheating. This is a practical solution for users who want to maintain consistency with the factory cooling system design in their Mercedes.

Specifications and technical data

• SKU: A2115015082
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2115015082
• Substitutable numbers: A2115015082, A 211 501 50 82
• Category: Hoses, Lines & Pipes

Purpose and Function in the Cooling System

The offered hose belongs to the group of Hoses, Tubes, and Pipes and is responsible for transporting coolant between the upper part of the radiator and the expansion tank. A correctly selected and sealed hose in this location:

• stabilizes the fluid level in the expansion tank,
• facilitates bleeding of the cooling system,
• reduces the risk of localized overheating in the upper part of the radiator,
• prevents leaks at a critical point in the system.

Thanks to its precise fit for the W211 / C219 body platforms, the hose maintains the correct routing within the engine bay, does not interfere with other components, and allows for the preservation of the factory installation layout.

Original Origin and Fit for Mercedes W211 / C219

This component was designed by Mercedes as part of the cooling system for E-Class (W211) and CLS (C219) models. This means that:

• it has the correct length and shape, adapted to factory mounting points,
• it is compatible with the original expansion tank and radiator,
• it allows for installation without modifications or the need for adapters,
• it maintains compliance with the manufacturer's factory standards.

Such a precise fit is particularly important in premium vehicles, where the cooling system operates under increased pressure and high temperatures, and any leaky or improperly routed hose can lead to failure.

Performance Characteristics and Benefits of Use

The coolant hose from the expansion tank to the radiator for Mercedes W211 / C219 is made from a material resistant to temperature and coolant action, which translates in practice to:

• resistance to swelling and hardening during prolonged use,
• maintaining flexibility under typical engine operating conditions,
• reducing the risk of micro-cracks and fluid seepage at connections,
• stable pressure maintenance in the upper section of the cooling system.

Replacing a worn or brittle hose with an original part allows for the restoration of proper coolant circulation, which is especially important when servicing the radiator, expansion tank, or after a coolant change.

Condition and Service Application

The offered hose is a used original part, allowing for an economical repair while maintaining factory fit. This type of component is often replaced during:

• repairs after coolant leaks in the upper part of the radiator,
• expansion tank service,
• cooling system inspection after engine overheating,
• preventive replacement of old rubber hoses.

A well-fitted hose in this part of the cooling system helps maintain a stable engine operating temperature and reduces the risk of unplanned vehicle downtime.

Expanding Mercedes Cooling System Service

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as return hoses, lower radiator hoses, or bleed pipes, check the available parts in the Mercedes Hoses, Tubes, and Pipes category.

For users interested in a broader approach to premium vehicle servicing, including the optimal use of salvaged parts, expert materials may also be useful. More on the practical approach to repairing electronics and comfort systems in premium segment cars can be found in the article on the long-term operation of iDrive systems and electronic modules in BMW 3 and 5 Series.