Water Pipe Mercedes W204 W207 OM651 Radiator Engine Coolant Hose A2045012225

Water Pipe Mercedes W204 W207 OM651 Radiator Engine Coolant Hose is an original cooling system component designed for vehicles with the OM651 engine powered by petrol. As part of the Hoses, pipes and lines group, it ensures proper coolant flow between engine components, which translates into a stable operating temperature for the power unit. The used OEM component is a sensible choice for technical repairs or restoring the efficiency of the cooling system in mid-size Mercedes cars.

Specifications and technical data

• SKU: A2045012225
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2045012225
• Substitutable numbers: A2045012225, A 204 501 22 25
• Fuel type: Petrol
• Category: Hoses, Lines & Pipes

Purpose and function in the cooling system

The described water pipe is a cooling system component responsible for transporting coolant between selected components of the OM651 engine. A correctly selected water hose:

• stabilizes coolant circulation within the engine's operating temperature range,
• reduces the risk of engine overheating,
• supports even heat dissipation from the block and cylinder head,
• ensures a tight connection between cooling system components.

In petrol-powered vehicles, the proper selection of the water pipe is crucial for maintaining engine performance parameters and long-term operational safety.

Benefits of using an original Mercedes pipe

Using an original water pipe in Mercedes W204 and W207 models with the OM651 engine allows you to maintain the factory hose routing geometry and fitment to ports and mounts. Thanks to this:

• you minimize the risk of leaks at connections,
• you maintain the correct positioning of the pipe relative to other components in the engine bay,
• you reduce material stress resulting from improper installation,
• you maintain compliance with the vehicle manufacturer's factory specifications.

The used OEM component is a technically sound solution for cooling system repairs, especially in cars that are several or more years old, where both quality and service economy are important.

Selection and technical compatibility

To correctly select the Water Pipe Mercedes W204 W207 OM651 Radiator Engine Coolant Hose for a specific car, it is worth verifying compatibility with:

• the body model (W204, W207),
• the type of power unit from the OM651 family,
• the cooling system version intended for petrol engines.

The component should be installed in place of the factory pipe, maintaining the correct disassembly and assembly sequence and using the appropriate clamps and connectors provided by the vehicle manufacturer. Proper installation reduces the risk of micro-leaks and improper cooling system bleeding.

Condition and use in vehicle service

The offered water pipe is a used component, which makes it an attractive solution for servicing older Mercedes W204 and W207 models, where the priority is to restore technical efficiency while maintaining reasonable costs. This type of component works well in:

• routine cooling system repairs after leaks are detected,
• comprehensive service work on the OM651 engine,
• restoration and maintenance of vehicles in the youngtimer segment.

If you are interested in a broader context of using used parts in cars from the 1998–2012 model years, it is worth reading an article describing practical modernization and repair scenarios, available here: The second life of a youngtimer – how used car parts rejuvenate cars from the 1998–2012 period.

Expanding the cooling system in a Mercedes

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 additional coolant lines, flexible hoses, or rigid pipes carrying coolant, check the available parts in the Mercedes Hoses, pipes and lines category.