Mercedes Vito W639 Washer Bottle Tank Windscreen Reservoir A6398690320

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes Vito W639 Washer Bottle Tank Windscreen Reservoir is an original component of the washer system, designed for professional windshield maintenance in this model. As part of the Washer fluid tanks, pumps, and nozzles group, it ensures a stable supply of operating fluid to the system, which translates into safe visibility in various weather conditions. This used OEM component is a sensible choice for users looking for a factory fit without the need to invest in a new part.

Specifications and technical data

• SKU: rhd-A6398690320-4
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6398690320
• Substitutable numbers: A6398690320, A 639 869 03 20
• Category: Washer Pumps, Reservoirs & Nozzles

Purpose and function in the washer system

The presented tank is a component dedicated to the washer system in the Mercedes Vito W639 generation. Its task is to store an adequate amount of fluid and provide a stable supply to the pumps and nozzles, so that the system can operate in a predictable and repeatable manner. The design developed by the vehicle manufacturer guarantees the correct placement of ports, mounts, and connections, which facilitates installation in the factory body points.

Benefits of using an original tank

Using an original washer fluid tank in the Mercedes Vito W639 allows you to maintain system performance parameters in accordance with the manufacturer's specifications. In practice, this means:

• a secure fit to factory brackets and supports,
• proper routing of hoses and connectors,
• appropriate operating capacity matched to the vehicle's usage profile,
• compatibility with original washer pumps and nozzles.

This minimizes the risk of leaks, installation stress, or system venting problems that may occur with parts of uncertain origin.

Component condition and installation aspects

The offered tank is a used component, which in the case of body and maintenance parts often represents a favorable compromise between cost and functionality. A part of this type, provided it maintains its integrity and correct geometry, can be successfully used for a long time while retaining its functional properties.

During installation, it is worth paying attention to:

• checking the condition of seals at the ports and pump sockets,
• correct routing of the hoses supplying the nozzles,
• careful mounting of the tank in the factory points, without tension.

Such an approach reduces the risk of fluid leaks and unwanted vibrations that could affect the durability of the entire system.

Why choose an OEM solution for your Mercedes

In the case of the Mercedes Vito W639, using original washer system components allows you to maintain the structural integrity of the vehicle. Factory fitment and material compatibility with other body and equipment elements reduce the risk of operational problems, such as cracks or leaks resulting from poor fit. This is especially important in commercial vehicles, where the vehicle often operates in difficult conditions and with high intensity of use.

If you are planning a comprehensive repair or upgrade of the area responsible for windshield cleanliness in your Mercedes and need other elements from the same group, such as additional tanks, pumps, or washer nozzles, check the available parts in the Mercedes washer fluid tanks, pumps, and nozzles category.

Part selection by numbers and technical support

When selecting a washer fluid tank for the Mercedes Vito W639, it is crucial to compare the OEM part number and any interchangeable numbers with the vehicle documentation or the existing part. This avoids ordering errors and ensures full compatibility with the washer system and body mounts.

If you want to deepen your knowledge about selecting maintenance parts by catalog numbers, diagnostics, and component regeneration, our guide on fuel systems may be helpful, where we discuss, among other things, operating principles, selection by VIN/OEM, and practical service tips: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

Summary

Mercedes Vito W639 Washer Bottle Tank Windscreen Reservoir is a practical solution for users who expect factory fitment and predictable washer system operation. A used, original element from the Washer fluid tanks, pumps, and nozzles group allows you to restore the full functionality of the system responsible for windshield cleanliness, which directly affects driving comfort and safety in daily use.