Mercedes W164 W204 W211 W221 OM642 Diesel Water Pump A6422001001

Mercedes W164 W204 W211 W221 OM642 Diesel Water Pump is an original cooling system component designed for OM642 diesel engines in popular Mercedes SUV, sedan, and mid-size segment models. Thanks to its factory design, it ensures stable coolant circulation, which translates to a safe operating temperature of the powertrain and reduced risk of overheating. This is a practical solution for users who want to maintain consistency with the factory cooling system specification.

Specifications and technical data

• SKU: A6422001001
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6422001001
• Substitutable numbers: A6422001001, A 642 200 10 01
• Fuel type: Diesel
• Category: Coolant Hoses

Purpose and Compatibility with OM642 Engine

The presented water pump is compatible with the OM642 diesel engine, widely used in Mercedes W164, W204, W211, and W221 models. The design is adapted to the characteristics of the diesel unit, where maintaining a stable operating temperature under high loads and long highway driving is crucial. Using a dedicated water pump allows for maintaining correct coolant flow parameters and proper system pressure.

Role of the Water Pump in a Diesel Cooling System

The water pump is the central element responsible for the forced circulation of coolant between the engine block, cylinder heads, radiator, and other system components. In a diesel engine like the OM642, this is particularly important due to:

• the unit's higher thermal efficiency and associated thermal load,
• operation under high torque at low RPMs,
• frequent use in towing, fully loaded driving, or long-distance travel.

A functional water pump helps maintain stable coolant temperature, which reduces the risk of thermal deformation, seal damage, and accelerated wear of cooperating components.

Characteristics and Benefits of Using an Original Mercedes Pump

The water pump offered here is from the Mercedes parts group and complies with the manufacturer's factory requirements. This means that the following are maintained:

• original impeller and flow channel geometry,
• compatibility with standard cooling system hoses and pipes,
• compatibility with factory mountings and OM642 engine accessories.

This ensures a predictable installation process, and after replacement, operating parameters close to factory specifications can be expected. This is particularly important in premium vehicles, where thermal stability affects not only the durability of the powertrain but also user comfort and driving refinement.

Condition, Service Application, and Parts Selection

The offered water pump is a component from the Cooling System Hoses and Pipes category, intended for service applications in Mercedes diesel vehicles. It serves as a replacement for the factory-installed pump in situations such as:

• decreased cooling system performance,
• coolant leaks around the pump,
• unusual noises from the pump drive area,
• preventive replacement at higher mileage or during OM642 unit overhaul.

To ensure correct selection, it is advisable to verify the pump's compatibility with the specific body style (W164, W204, W211, W221) and engine configuration, using catalog data or part numbers assigned to the vehicle.

Technical Support and Educational Materials

If you want to better understand how to properly diagnose overheating problems and how to care for the entire cooling system in premium cars, check out the guide on our blog: Engine Cooling System – Overheating, Repair, and Used Radiators. You will find practical tips on operating and servicing components responsible for engine operating temperature.

If you are planning comprehensive service for your Mercedes' cooling system and also need other components related to the coolant circuit, such as additional hose sections or connectors, check the available parts in the Mercedes Cooling System Hoses and Pipes category.