Mercedes W211 W320 Auxiliary Water Heater Pump R6422010710

Mercedes W211 W320 Auxiliary Water Heater Pump is an original cooling system component designed for installation in the rear part of the vehicle. Thanks to its factory design, it ensures a stable coolant flow, which translates into safe engine operating conditions and predictable performance of the power unit. This is a solution for users looking for a proven, technically matched water pump for their Mercedes E-Class W211 W320.

Specifications and technical data

• SKU: R6422010710
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: R6422010710
• Substitutable numbers: R6422010710, R 642 201 07 10
• Location on the vehicle: Rear
• Category: Water Pumps

Purpose and function in the cooling system

The presented water pump belongs to the Water pumps category and is responsible for the forced circulation of coolant in the system, which is crucial for maintaining a stable engine operating temperature. Its location in the rear of the vehicle allows for effective cooperation with other cooling system components, such as hoses, auxiliary radiators, or flow control elements.

Choosing a pump dedicated to a specific W211 W320 version reduces the risk of fitment issues, leaks, or improper fluid flow. The appropriate hydraulic characteristics promote even heat distribution, which helps protect the engine from overheating in both city and highway driving conditions.

Original origin and reference numbers

The pump was designed by the manufacturer specifically for Mercedes vehicles, which means it maintains factory manufacturing standards and compatibility. The OEM designation and available replacement numbers facilitate clear identification of the part in service catalogs and VIN-based selection systems, as well as comparison with the component currently installed in the car.

Thanks to this, a mechanic or user can precisely verify the compatibility of the pump with a specific vehicle configuration, which is particularly important when working with the complex cooling systems used in modern Mercedes diesel engines.

Installation characteristics and application

The location of the pump in the rear of the vehicle requires following the correct disassembly and assembly sequence for adjacent components; however, using an original design significantly facilitates service work. The mounting holes, connection ports, and body geometry are matched to the factory system, allowing for installation without the need for system modifications.

In practice, this translates into:

• secure fitment with the existing cooling system,
• maintenance of the fluid flow path intended by the manufacturer,
• the ability to use standard service procedures.

Part condition and benefits of choosing a used component

The offered water pump is a used component, which allows for a significant reduction in repair costs compared to purchasing a new part, while maintaining the original design and fitment for the vehicle. Choosing such a solution is often preferred for older W211 models, where a reasonable balance between durability and repair budget is important.

Using original, used cooling system components is particularly beneficial where dimensional compliance, correct port positioning, and predictable long-term performance are key.

Technical support and part selection

To correctly select a water pump for a specific engine version and model year, it is worth using the OEM number and replacement numbers, as well as vehicle data from the registration document. In case of doubt, it is helpful to compare the shape of the body and the arrangement of connections with the currently installed element.

Additionally, during service work related to the cooling system and accessory drive, it is worth paying attention to the condition of hoses, clamps, and other components working with the pump to avoid the need for re-disassembly in the near future.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other elements from the same group, such as additional pumps, coolant circuit elements, or components working with the cooling system, check the available parts in the Mercedes Water pumps category.

To better understand the relationships between fuel and cooling system components and to correctly select parts by OEM numbers, it is worth reading the guide on our blog: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.