Mercedes X470 Nissan Navara OM699 Auxiliary Additional Water Pump 925164GA0A

Mercedes X470 Nissan Navara OM699 Auxiliary Additional Water Pump is a specialized cooling system component designed for diesel-powered vehicles. It ensures stable coolant circulation under critical engine operating conditions, supporting the main pump and improving the engine's thermal safety. This used OEM component is a sensible choice for drivers looking for a technically compatible solution at an attractive price.

Specifications and technical data

• SKU: 925164GA0A
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: 925164GA0A
• Substitutable numbers: 925164GA0A, 0392023219, 0 392 023 219
• Fuel type: Diesel
• Category: Water Pumps

Purpose and role in the cooling system

The auxiliary water pump in Mercedes X470 and Nissan Navara models with the OM699 unit is responsible for supporting coolant circulation in areas particularly prone to overheating. This is especially important in diesel engines, where thermal loads are high, and a stable operating temperature directly affects component durability and engine performance.

This type of pump can also operate when the engine is turned off (depending on the vehicle configuration), which promotes even cooling of components after intense driving, towing a trailer, or off-road use. This reduces the risk of localized overheating and accelerated wear of cooling system components.

Benefits of using an auxiliary water pump

Using an original auxiliary water pump in the cooling system of a diesel vehicle provides a number of practical benefits:

• more even temperature distribution within the engine and accessories,
• better heat dissipation under high engine load,
• support for the main water pump under critical operating conditions,
• reduced risk of overheating in city traffic, off-road, or when towing heavy loads,
• maintenance of operating parameters in accordance with the vehicle manufacturer's specifications.

For users of the Mercedes X470 and Nissan Navara with the OM699 engine, this means more stable cooling system operation, which translates into greater operational predictability and a lower risk of costly failures.

Technical characteristics and fitment

The presented pump belongs to the Water pumps category and is intended for diesel-powered vehicles. The OEM design ensures proper fitment to factory mounts and correct integration with the electrical installation and cooling system of the given model. As a result, installation can be carried out in an orderly manner, without the need for modifications or compromise solutions.

The used nature of the part allows for lower repair costs compared to a new component, while maintaining compliance with factory specifications. This is a good solution for intensively used vehicles, where both proper operation and service economy are important.

Operation in diesel engines and diagnostics

In diesel units, a properly functioning auxiliary water pump is important not only for cooling the engine itself but also for supporting systems, such as interior heating or accessory components that require a stable operating temperature. Regular inspection of leaks, connector condition, and electrical supply integrity helps maintain the efficiency of the entire cooling system.

To better understand the relationship between the cooling system and engine fuel supply, it is worth checking out material discussing the operation and diagnostics of components responsible for fuel delivery. Practical information can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which helps to look at engine operation in a holistic way.

Why choose a used OEM pump

By choosing a used auxiliary water pump, you gain access to an original component with factory geometry and operating parameters. This is particularly important in vehicles where the cooling system is precisely tuned to the characteristics of the diesel engine. A used OEM element represents a reasonable compromise between cost and technical repair correctness.

If you want to better prepare for choosing used cooling system elements and other components, a guide on the pitfalls of buying second-hand parts will be helpful: Buying used car parts – common mistakes when choosing tuning parts. It will allow you to consciously assess the condition of components and avoid typical problems.

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 auxiliary pumps, coolant circuit elements, or auxiliary cooling modules, check out the available parts in the Mercedes Water pumps category.