Mercedes W211 C219 Radiator Expansion Tank Top Coolant Hose A2115015182

Expansion tank coolant hose for Mercedes W211 and C219 is an original part from the Hoses, pipes and tubes group, designed for operation in the cooling fluid circuit. It ensures a stable connection between the upper part of the cooling system and the expansion tank, which directly impacts the proper fluid circulation and maintenance of the engine's optimal operating temperature. A used OEM component is a sensible choice for cooling system service when you prioritize factory fit and predictable performance parameters.

Specifications and technical data

• SKU: A2115015182
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2115015182
• Substitutable numbers: A2115015182, A 211 501 51 82
• Category: Hoses, Lines & Pipes

Purpose and function in the cooling system

This upper coolant hose works with the expansion tank in Mercedes E-Class W211 and CLS C219 models, creating a sealed connection in a critical part of the cooling system. It is responsible for:

• stable supply and return of coolant between the expansion tank and the rest of the system,
• maintaining the correct operating pressure in the circuit,
• reducing the risk of engine overheating due to leaks or air ingress.

Thanks to its construction in line with factory Mercedes standards, the hose maintains the correct routing geometry, which facilitates installation and minimizes mechanical stress during operation.

Construction and fit for Mercedes W211 / C219

The hose belongs to the group of flexible cooling system components, designed specifically for the engine bay architecture of the Mercedes W211 and C219. This means:

• appropriately selected inner diameter for the cooling system spigots,
• bending profile adapted to the factory routing in the engine bay,
• compatibility with original clamps and fasteners.

Such a fit reduces stress, friction with adjacent components, and the risk of abrasion during prolonged use. Original origin from the Mercedes brand translates to predictable material behavior at high temperatures and under variable pressure.

Benefits of using an original hose

Using an original upper coolant hose to replace a worn or non-factory aftermarket part allows you to:

• maintain the factory operating characteristics of the cooling system,
• minimize the risk of leaks at connections due to correct dimensional tolerances,
• ensure proper bleeding and fluid circulation across the entire range of engine loads.

Precise fit for the specific generation of Mercedes W211 and C219 simplifies the mechanic's work, reduces installation time, and minimizes the need for additional modifications or forcing the hose into place.

Condition and service application

This part is from a disassembly and is intended for reinstallation in vehicles where the upper expansion tank hose needs replacement. It is a practical solution in situations where the existing hose shows signs of aging, cracking, surface crazing, or leaks at the ends. Choosing a used OEM component allows for high compliance with factory specifications while optimizing repair costs.

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 parts from the same group, such as flexible fluid hoses, return hoses, or connecting pipes, check the available parts in the Mercedes Hoses, pipes and tubes category.

For users interested in a broader perspective on the operation and service costs of modern diesel engines, an article comparing popular BMW engines may be helpful – details can be found in the material BMW N47 vs M57 / M57N / M57N2 – ranking of legendary diesels.