Mercedes Vito W639 Washer Bottle Tank Windscreen Reservoir A6398690320

Mercedes Vito W639 Washer Bottle Tank Windscreen Reservoir is an original component of the washer system, designed for professional windscreen maintenance in this model. Thanks to its factory design, it ensures proper fitment to the bodywork, stable mounting, and correct operation with the washer pump and nozzles. This used component allows for an economical yet technically correct repair of the washer system in the Mercedes Vito W639.

Specifications and technical data

• SKU: rhd-A6398690320-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6398690320
• Substitutable numbers: A6398690320, A 639 869 03 20, KD
• Category: Washer Pumps, Reservoirs & Nozzles

Purpose and function in the washer system

The presented reservoir is a component of the system responsible for storing washer fluid and supplying it steadily to the pump and nozzles. In the Mercedes Vito W639, a correctly selected reservoir is crucial for:

• maintaining the proper amount of fluid in the system,
• ensuring the continuity of the washer pump operation,
• protecting the pump against dry running and airlocks,
• secure routing of hoses and connectors in the mounting compartment.

Thanks to a design compliant with Mercedes factory standards, the reservoir works with original mounts and equipment, which facilitates installation and service.

Construction and fitment for Mercedes Vito W639

Mercedes Vito W639 Washer Bottle Tank Windscreen Reservoir has been designed specifically for the body geometry of this model, which translates into:

• proper body shaping for the mounting space,
• factory mounting points to the bodywork,
• adaptation to work with the pump and washer nozzles intended for the Vito W639,
• maintaining the correct position of connection ports relative to the electrical harness and fluid hoses.

The original origin from the Mercedes group promotes the consistency of the entire system, minimizing the risk of leaks and assembly problems characteristic of universal replacements.

Condition, verification, and service application

The item is offered as a used part, which allows for lower repair costs while maintaining the factory design. This type of component is particularly useful in situations of:

• mechanical damage to the reservoir (cracks, broken mounts),
• leaks resulting from collisions or corrosion of mounting elements,
• the need to restore the efficiency of the washer system after body and paint repairs.

Selection by OEM number and interchangeable numbers (visible in the technical specification) facilitates precise matching to a specific version of the Vito W639, which is important given equipment and model year differences.

Benefits of using an original washer reservoir

Using an original reservoir in the washer system brings measurable operational benefits:

• stable operation of the washer system – proper alignment of ports and hoses reduces the risk of airlocks and kinks,
• better compatibility with the factory pump and nozzles,
• easier installation thanks to the retention of original mounting points,
• consistency with other body elements and covers in the mounting compartment.

For workshops and individual users, this means shorter installation time, less risk of modifications, and a more predictable service result.

System expansion and related Mercedes components

If you are planning a comprehensive repair or upgrade of the washer system zone in your Mercedes and need other elements from the same group, such as additional reservoirs, pumps, or washer nozzles, check the available parts in the category Mercedes washer fluid reservoirs, pumps, and nozzles.

To better understand the principles of selecting components by OEM numbers and the proper operation of elements similar in construction to reservoirs, it is worth reading the guide on our blog: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, where practical aspects of diagnostics and replacement of reservoirs and cooperating components are discussed.

If you are interested in the conscious use of used parts in service projects or vehicle modifications, the article The best used parts for tuning your car, describing the advantages and principles of safe selection of components from the secondary market, may also be helpful.