Mercedes W205 Diesel OM651 Coolant Hose Radiator Auto Transmission Cooler Line

Mercedes W205 Diesel OM651 Coolant Hose Radiator Auto Transmission Cooler Line is an original cooling system component designed for OM651 diesel engines in W205 generation C-Class models. Thanks to its factory geometry and precise fit for the specific engine unit, it ensures stable coolant flow and proper integration with other system components. This is a practical solution for users who want to maintain cooling system performance in accordance with manufacturer standards.

Specifications and technical data

• SKU: A2055015400
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2055015400
• Substitutable numbers: A2055015400, A 205 501 54 00
• Fuel type: Diesel
• Category: Coolant Hoses

Purpose and function in the cooling system

The hose belongs to the Cooling system hoses and pipes category and is responsible for the controlled flow of coolant between the OM651 engine components and other parts of the system. A properly selected water hose reduces the risk of localized overheating, supports uniform heat dissipation from the engine block, and helps maintain a stable operating temperature for the diesel unit.

In the case of diesel engines like the OM651, proper coolant circulation is essential for the durability of the cylinder head, seals, and accessories. Using a hose with the correct shape and diameter restores proper flow geometry and minimizes mechanical stress on connectors and joints.

Compatibility with the OM651 diesel engine

The component has been designed for Diesel engines, which means it is matched to the thermal characteristics and construction of the OM651 engine used in the Mercedes W205. This includes proper routing within the engine bay, taking into account typical mounting points, bending radii, and the working space around the accessories.

As a result, the water hose works with factory brackets and clamps, and its installation does not require any modifications to other cooling system components. Maintaining the original hose routing reduces the risk of chafing, excessive vibration, and contact with hot or moving engine parts.

Characteristics of the used component

The offered hose comes from a Mercedes vehicle and is classified as a used part. This type of component is a sensible choice when the factory hose has been damaged, and the priority is to maintain the original cooling system design at controlled repair costs. A used component allows for restoring the original hose configuration without the need for aftermarket replacements with uncertain fitment.

Before installation, standard service procedures are recommended: checking for leaks, the condition of the connectors, sealing surfaces, and any signs of excessive wear. A properly verified water hose can continue to function in the cooling system, ensuring stable thermal conditions for the diesel engine.

Support in selection via OEM number and VIN

To ensure that the hose is fully compatible with your specific version of the Mercedes W205, it is worth verifying compatibility using the OEM number and interchangeable numbers assigned to this reference. If in doubt, the vehicle's VIN can be helpful, as it allows for precise identification of the engine and cooling system configuration. Practical tips on such verification can be found in the guide how to choose the right car part by VIN and OEM number, which describes the step-by-step process of checking the compatibility of used components.

The importance of a functional hose in the cooling system

A functional water hose in a diesel engine has a direct impact on protecting the power unit from overheating. Leaks, pressure drops in the system, or improper fluid flow can lead to damage to the head gasket, deformation of aluminum components, or accelerated wear of accessories. It is worth reading the practical examples and consequences of neglect described in the article Engine cooling system – overheating, repair, and used radiators to better assess the role of hoses and pipes in the entire system.

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 lines, hoses, or water pipes, check the available parts in the Mercedes cooling system hoses and pipes category.