Mercedes W204 S205 C218 Coolant Inlet Connection Water Circulation A2742000156

Mercedes W204 S205 C218 Coolant Inlet Connection Water Circulation is an original cooling system component designed for precise coolant flow management in Mercedes engines. Thanks to its factory-spec geometry and perfect fit for specific vehicle generations, it ensures stable thermal conditions for the power unit and proper interaction with other components. This is the ideal solution for users seeking a proven, compatible component rather than random aftermarket replacements.

Specifications and technical data

• SKU: A2742000156
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2742000156
• Substitutable numbers: A2742000156, A 274 200 01 56
• Category: Coolant Hoses

The role of the coolant inlet connection in the cooling system

The coolant inlet connection in Mercedes W204, S205, and C218 models is responsible for directing coolant to critical points of the engine. A properly selected component:

• maintains the tightness of connections within cooling hoses and pipes,
• ensures stable fluid flow without uncontrolled turbulence,
• reduces the risk of localized overheating in the cylinder head and engine block area,
• supports even temperature distribution throughout the entire system.

As a result, the cooling system operates in a predictable manner, and the engine maintains proper performance parameters across a wide range of loads.

Design and fitment for Mercedes W204, S205, C218

This connection has been specifically designed for the cooling system architecture of selected Mercedes models, which translates into:

• factory-perfect fit with cooling system hoses and pipes,
• properly selected diameter and shape of the connectors,
• compatibility with original clamps and mounts,
• maintenance of proper connection rigidity in the engine bay.

Such fitment minimizes the risk of leaks, facilitates installation, and allows the cooling system to be maintained in a configuration consistent with the vehicle manufacturer's specifications.

Benefits of using an original connection

Using an original coolant inlet connection in a Mercedes provides tangible operational benefits:

• stable engine operating temperature due to the preservation of factory fluid flow,
• reduced risk of leaks in the area of hose connections,
• easier diagnostics and maintenance of the cooling system,
• no need for modifications or fitting aftermarket parts.

This is particularly important in vehicles where the cooling system operates under high thermal load, and any drop in efficiency can lead to costly engine failures.

Component condition and service application

The connection belongs to the Cooling system hoses and pipes group, meaning it is designed to work in direct contact with coolant and engine auxiliary components. As a used part, it represents a good service solution in situations where the existing connection has suffered mechanical damage, corrosion, or thermal deformation, and the priority is to maintain the original geometry of the system.

Technical support and additional information

To better understand the impact of a functional connection and other components on engine durability, it is worth checking out our guide on the diagnostics and operation of cooling systems: Engine cooling system – overheating, repair, and used radiators. The article discusses practical aspects of cooling system operation in various models and helps assess when component replacement is necessary.

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 flexible hoses, rigid pipes, or additional connectors, check out the available parts in the Mercedes cooling system hoses and pipes category.