Mercedes W205 W213 C238 W257 OM654 Auxiliary Coolant Water Pump A0005000900

Mercedes W205 W213 C238 W257 OM654 Water Pump A0005000900 is an original coolant pump from the Mercedes water pumps group, designed for modern OM654 diesel engines in C-Class, E-Class, and CLS models. The used OEM part helps maintain factory engine cooling parameters, ensuring stable operating temperature and safe operation across a wide range of loads.

Specifications and technical data

• SKU: A0005000900
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0005003600
• Substitutable numbers: A0005000900, A 000 500 09 00, 0392023240, 0 392 023 240
• Category: Water Pumps

Application and Compatibility

The presented water pump is designed for the OM654 engine fitted in Mercedes C-Class (W205), E-Class (W213), C238 coupe, and W257 CLS models. The OEM construction ensures proper fitment within the cooling system, correct port positioning, and seamless integration with engine accessories.

By maintaining original geometry and flow rates, the pump ensures proper coolant circulation across the entire RPM range, which is particularly crucial for modern, highly thermally efficient diesel engines.

Construction and Technical Characteristics

The water pump is designed as a cooling system component with optimized performance, tailored to the specifics of the OM654 engine. The applied body and impeller design ensures:

• stable coolant flow at low and high RPMs,
• appropriate system pressure,
• harmonious cooperation with the thermostat and other cooling system components.

Original OEM manufacturing means adherence to factory dimensional tolerances, which simplifies installation and minimizes the risk of leaks at connections to the engine block and hoses.

Benefits of Using an Original Water Pump

Using a factory water pump in the OM654 engine offers tangible operational benefits:

• Adequate Cooling Performance – matched to the thermal characteristics of the powertrain,
• Compatibility with Engine Electronics and Control – operating parameters align with manufacturer specifications,
• Precise Mechanical Fitment – no need for modifications or adjustments to mounting components.

A used OEM part is a sensible choice for users who wish to maintain the factory standard of the cooling system at controlled service costs, while ensuring high reliability in daily operation.

Condition, Verification, and Part Selection

The water pump is a used part obtained from disassembly, offered for economical cooling system repair while preserving original manufacturing quality. Before installation, a standard check of system tightness and coolant condition is recommended, along with verification of compatibility with the specific OM654 engine version in the given vehicle body.

Part selection should be based on vehicle data and catalog numbers to ensure full compatibility with the installed engine and accessory configuration. In case of doubt, factory number lookup procedures and service documentation can be helpful.

If you want to better understand the principles of selecting and diagnosing fuel system components and their cooperating systems, it is worth referring to the guide article Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Reconditioning, which discusses practical aspects of working with OEM components.

Other Mercedes Water Pumps

For users looking for other Mercedes water pumps for various engine and body versions, a dedicated category has been prepared. Check the available Mercedes water pumps to select the part best suited to your specific car model and configuration.