Description
The Mercedes W204 C207 OM642 Overflow Water Hose is an item from the Cooling System Hoses and Pipes category, designed for use in the OM642 engine cooling system of Mercedes C-Class W204 and C207 models. It is responsible for the controlled flow of coolant in the overflow circuit, which supports the stable operating temperature of the power unit and reduces the risk of overheating.
Specifications and technical data
- SKU: A2045010325
- Mark: Mercedes (Genuine OE)
- Condition: Used
- OEM Part Number: A2045010325
- Substitutable numbers: A2045010325, A 204 501 03 25
- Category: Coolant Hoses
Purpose and Function in the Cooling System
The water overflow hose in the OM642 engine plays a crucial role in the proper functioning of the cooling system, ensuring the removal of excess coolant and bleeding of the circuit. For Mercedes diesel engines, stable operating temperature is essential for the durability of accessories, the turbocharger, and the injection system.
Selecting the correct overflow hose is particularly important for:
- cooling system repairs after engine overheating,
- upgrading or replacing the radiator, water pump, or thermostat,
- addressing leaks and air in the cooling circuit.
Construction and Fitment for Mercedes W204 / C207 OM642
The offered item is designed as a factory overflow hose for the OM642 engine in W204 and C207 body styles. This means its geometry, connection diameters, and routing are adapted to the standard layout in the engine bay, facilitating installation and maintaining the original cooling system configuration.
This precise fitment translates to:
- secure seating on the cooling system spigots,
- maintaining proper coolant flow in the overflow circuit,
- reducing mechanical stress and the risk of abrasion against adjacent components.
Benefits of Using an Original Overflow Hose
Choosing an overflow hose dedicated to a specific engine and body style helps maintain cooling system operating parameters in line with the manufacturer’s specifications. In practice, this means:
- stable engine operating temperature across a wide range of loads,
- reduced risk of localized overheating and cavitation in the cooling system,
- better compatibility with other system components, such as the radiator, heater core, and expansion tank.
An item from this group is particularly important in vehicles subjected to higher thermal loads, e.g., highway driving, towing, or urban conditions with frequent traffic jams.
Item Condition and Service Application
The offered hose is a used part, allowing for economical cooling system repairs while maintaining compliance with the original design. This type of component is often chosen for comprehensive OM642 engine services when multiple parts need replacement simultaneously and cost optimization is desired.
The overflow hose is suitable for both standard replacement of worn hoses and for diagnosing issues with overheating, air in the system, or unstable cooling system operation.
Technical Support and Additional Materials
To better understand the impact of hoses and pipes on engine durability and the symptoms of overheating, it is worth reading the guide: Engine Cooling System – Overheating, Repair, and Used Radiators. The article discusses practical aspects of diagnosing and servicing cooling systems in popular models.
When preparing your car for the winter season or after significant mileage, the material on inspecting wear parts may also be helpful: Winter Essentials: Used Parts Before the Frost, where you will find checklists and tips for assessing component condition.
Other Mercedes Cooling System Hoses and Pipes
If you are also looking for other Mercedes Cooling System Hoses and Pipes for your car, check out the Mercedes Cooling System Hoses and Pipes available in our store to select a complete solution for your planned service.
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