Mercedes C118 W177 Radiator Coolant Hose AMG Water Cooling Pipe A1775010103

Mercedes C118 W177 Radiator Coolant Hose AMG Water Cooling Pipe is an original cooling system component from the Lines, hoses and pipes group, designed for vehicles with a gasoline engine. Engineered by the vehicle manufacturer, it ensures proper coolant flow, stable thermal operation of the power unit, and safe integration with other system components.

Specifications and technical data

• SKU: A1775010103
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1775010103
• Substitutable numbers: A1775010103, A 177 501 01 03
• Fuel type: Petrol
• Category: Hoses, Lines & Pipes

Purpose and function in the cooling system

The presented water pipe is responsible for the controlled flow of coolant between cooling system components in Mercedes C118 and W177 series models in AMG versions with a gasoline engine. A properly selected radiator hose minimizes the risk of engine overheating, leaks, and pressure drops in the fluid circuit.

Thanks to its factory geometry and fitment to the specific engine bay architecture, the pipe maintains the correct bending radius, does not kink, and does not rub against adjacent components, which translates into stable, predictable cooling system performance under both road and track conditions.

Construction, fitment, and technical parameters

As an element from the Lines, hoses and pipes group, the radiator hose is made of materials resistant to high temperatures, operating pressure, and contact with the coolant used in gasoline engines. The pipe design includes:

• a profile matched to the factory routing in the engine bay,
• ends prepared for compatibility with factory nozzles and connectors,
• appropriate rigidity to limit deformation during temperature changes.

This solution allows for maintaining the factory fluid flow characteristics, which is particularly important in AMG versions, where the power unit generates higher thermal loads than in standard variants.

Condition, installation, and service application

The item is offered in used condition, which allows for an economical yet functional replacement of a damaged or leaking pipe in the cooling system. In practice, this means the ability to restore proper coolant circulation without the need to invest in a complete new set of hoses.

The pipe is intended for installation in place of the factory component, maintaining original mounting points and routing. The replacement involves removing the old hose, cleaning the nozzles, checking the clamps, and installing the offered pipe while following cooling system bleeding procedures.

Benefits of using an original water pipe

Using an original water pipe in a Mercedes C118 / W177 AMG with a gasoline engine ensures:

• compatibility with the factory cooling system – no need for modifications or diameter adjustments,
• stable coolant flow across the full range of engine loads,
• reduced risk of leaks resulting from poorly fitted aftermarket replacements,
• maintenance of the engine's factory operating temperature characteristics.

For users of AMG versions, where the cooling system operates under more demanding conditions, the proper selection of the water pipe has a direct impact on engine durability and operational safety.

Cooling system expansion and additional materials

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 coolant lines, flexible return hoses, or rigid guide pipes, check the available parts in the Mercedes Lines, hoses and pipes category.

To compare the characteristics of sports power units with standard constructions and to better understand the loads to which the cooling system and engine accessories are subjected, it is worth reading the technical material: Audi RS vs other models – what is hidden under the hood and chassis?.