Mercedes C118 W177 W247 Water Coolant Hose Pipe Line M260 A2478306703

Mercedes C118 W177 W247 Water Coolant Hose Pipe Line is an original component from the Cooling system hoses and pipes group, designed for operation in the engine coolant circuit. Engineered by the vehicle manufacturer, it ensures proper coolant routing and stable cooperation with other cooling system components in modern Mercedes power units.

Specifications and technical data

• SKU: A2478306703
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2478306703
• Substitutable numbers: A2478306703, A 247 830 67 03
• Category: Coolant Hoses

Purpose and function in the cooling system

This coolant hose is a component dedicated to the M260 family petrol engine, used in C118, W177, and W247 bodies. It is responsible for the controlled routing of coolant between key sub-assemblies, which helps maintain a stable operating temperature of the power unit and reduces the risk of overheating during intensive use.

Thanks to its factory-fit design for the specific engine bay architecture, the hose maintains the correct geometry, minimizes stress on connectors and joints, and facilitates proper installation without the need for modifications. This is particularly important in modern designs where space is limited and the cooling system operates under increased pressure.

Construction and fitment for Mercedes

The offered component comes from the Mercedes brand, which means compliance with factory quality and dimension standards. The hose is designed to work with the original connectors, clamps, and fittings used in the given engine type, ensuring system tightness and proper coolant flow.

The factory design of the hose takes into account:

• a properly selected internal diameter to ensure correct flow,
• a shape adapted for routing in the engine bay,
• locations for factory mounts and brackets.

Such a solution reduces the risk of rubbing against other components, thereby decreasing the probability of mechanical damage during operation.

Benefits of using an original cooling hose

Using an original hose from the Cooling system hoses and pipes category to replace a worn or leaking component allows for the restoration of proper coolant circulation and thermal stability of the engine. This directly translates into:

• reducing the risk of engine overheating,
• maintaining the correct operating parameters of the M260 engine,
• limiting thermal loads on other components, such as gaskets, the cylinder head, or the turbocharger (if present in the given configuration).

The original component also ensures consistency with the manufacturer's service documentation, which facilitates diagnostics and future cooling system inspections.

Condition and service application

The hose is offered as a used part, which is a cost-effective solution for service repairs when you want to maintain original specifications while optimizing costs. It is a practical choice when replacing a damaged section of the cooling installation, especially in vehicles used intensively or after accident repairs.

Before installation, a standard service procedure is recommended: checking the tightness of the connections, verifying the condition of the clamps, and bleeding the system after refilling with fresh coolant in accordance with the vehicle manufacturer's recommendations. This approach allows you to fully utilize the potential of the offered hose and ensure the stable operation of the entire system.

Technical support and additional information

To better understand the importance of an efficient coolant circuit for the longevity of the power unit, it is worth reading the guide on our blog: Engine cooling system – overheating, repair, and used radiators. You will find practical tips regarding diagnostics and the operation of cooling systems in modern cars.

If you are planning a comprehensive repair or upgrade of the cooling system area in your Mercedes and need other components from the same group, such as additional hoses, return lines, or sections connecting to the radiator, check the available parts in the Mercedes cooling system hoses and pipes category.