Mercedes W205 Coolant Hose Water Cooling Pipe Line OM651 Diesel A2055017484

Mercedes W205 Water Hose OM651 Diesel is a cooling system component from the Hoses, Pipes and Tubes category, designed for OM651 diesel engines. Its original design ensures proper coolant flow, stable engine operation, and safe heat dissipation during everyday use. It's a practical choice for users seeking a proven, factory-standard solution for their Mercedes W205 diesel model.

Specifications and technical data

• SKU: A2055017484
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2055017484
• Substitutable numbers: A2055017484, A 205 501 74 84
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and Function in the Cooling System

The water hose in the OM651 engine is responsible for directing coolant between key system components such as the engine block, radiator, and heater core. A correctly selected hose:

• maintains a stable coolant circulation in the diesel engine,
• limits the risk of engine overheating,
• supports even heat dissipation under load,
• ensures leak-free connections in the cooling system.

Thanks to its adaptation to the specifics of the OM651 diesel engine, the hose is designed to operate under elevated temperatures and variable working pressures.

Construction, Fitment, and Installation

This hose is part of Mercedes' factory components, which translates to precise fitment within the W205 model's cooling system. Its shape, end diameters, and connection points are designed for specific routing within the engine bay, facilitating installation and minimizing stress during operation.

In practice, this means:

• the hose follows the factory routing path,
• connections to spigots and fittings are stable and leak-proof,
• there is no need for modifications or fitting universal hoses.

For a mechanic or a knowledgeable owner, this translates to a faster replacement and a lower risk of leaks after installation.

Operational Characteristics in a Diesel Engine

Diesel engines generate specific thermal and vibrational loads, which is why the water hose for the OM651 is designed for operation under such conditions. The hose's construction supports:

• resistance to temperature changes typical for diesel units,
• shape stability during prolonged operation under load,
• reduced risk of cracks and micro-leaks at connections.

A correctly selected cooling system hose helps maintain engine operating parameters within a safe range, which is crucial for both engine durability and preserving factory performance.

Condition, Verification, and Service Application

This item is offered as a used part, meaning it comes from disassembly and can be a cost-effective alternative to a new hose. This type of component is particularly useful for:

• routine cooling system repairs following a failure or leak,
• preventive maintenance when the factory hose shows signs of wear,
• restoring full cooling system functionality after modifications or a collision.

To ensure the reliability of the cooling system, professional installation by an experienced service center is recommended, using the appropriate coolant and checking for leaks after replacement.

Mercedes Hoses, Pipes and Tubes – Part Selection

If you need other components from the Hoses, Pipes and Tubes category dedicated to this brand, check our offer for Mercedes hoses, pipes and tubes to select components that fit your car's specific configuration.

To compare the characteristics of different solutions used in sports and standard cars, including the impact of cooling systems on performance, you can read the article about RS models: Audi RS vs. other models – what's under the hood and chassis?.