Cooling Pipe Mercedes C207 W212 C218 M276 Coolant Hose Water A2125011684

Description

Cooling Pipe Mercedes C207 W212 C218 M276 Coolant Hose Water is an original cooling system component designed for the precise routing of coolant between key engine sub-assemblies. Thanks to its factory-spec geometry and perfect fit for the M276 unit, it ensures stable thermal conditions, reducing the risk of overheating and leaks. It is a practical solution for users who want to maintain the consistency and reliability of the cooling system in their Mercedes.

Specifications and technical data

• SKU: A2125011684
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2125011684
• Substitutable numbers: A2125011684, A 212 501 16 84
• Category: Coolant Hoses

Purpose and function in the cooling system

This hose is part of the Cooling system pipes and hoses category, responsible for transporting coolant within the M276 engine in C-Class and E-Class coupes, sedans, and shooting brakes. Properly routed coolant flow:

• stabilizes the operating temperature of the power unit,
• reduces localized overheating of aluminum components and seals,
• supports even heat dissipation from the engine block and cylinder heads.

By maintaining the factory shape and diameter of the hose, the cooling system operates predictably, which promotes a longer service life for the engine and its accessories.

Construction and fit for the M276 engine

The hose was designed by Mercedes specifically for the M276 engine architecture, taking into account the placement of ports, clamps, and mounting points. The appropriate stiffness and flexibility of the material:

• facilitates installation in a tight engine bay,
• minimizes stress on ports and connections,
• ensures stable hose routing even under temperature and load fluctuations.

Such a fit reduces the risk of twisting, kinking, or rubbing against adjacent components, which is important for long-term operation.

Component condition and operational aspects

The offered hose comes from a used vehicle, which allows for an economical replacement of the cooling system component while maintaining the original manufacturer’s specifications. A used OEM component is a good solution in situations where:

• you want to restore system integrity after a failure or connector corrosion,
• you care about maintaining factory hose routing,
• you are looking for a part consistent with the original design, without compromising on fitment.

Before installation, it is recommended to perform a standard inspection of the hose surface, sockets, and clamps, as well as to replace the coolant in accordance with the manufacturer’s service procedure.

Selection by OEM number and compatibility

The hose is marked with the OEM part number specific to this reference, which facilitates clear identification and selection for a specific engine version and body type. In case of doubts regarding fitment for a specific vehicle, it is worth using a VIN-based configurator or comparing the markings with the currently installed part.

For users who want to streamline the process of selecting parts by OEM or VIN number, a practical guide will be helpful: how to choose the right car part by VIN and OEM number. The tips contained therein allow you to reduce the risk of purchasing an incompatible part and speed up the service process.

Cooling system and engine durability

A functional cooling hose has a direct impact on the thermal safety of the M276 unit. Leaks, a drop in fluid level, or flow disturbances can lead to overheating, seal damage, and in extreme cases, serious engine failure. It is therefore worth treating the replacement of pipes and hoses as part of preventive maintenance, especially in vehicles with higher mileage.

If you want to better understand the relationships between the operation of hoses, the radiator, and other components, check out the article: Engine cooling system – overheating, repair, and used radiators. This is a good supplement to your knowledge when planning comprehensive cooling system maintenance.

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, return hoses, or sections connecting to the radiator, check the available parts in the Mercedes cooling system pipes and hoses category.