Mercedes Vito W639 Windscreen Washer Bottle Tank Reservoir A6398690320

Mercedes Vito W639 Windscreen Washer Bottle Tank Reservoir is an original windshield cleaning system component designed for installation in W639 generation Vito models. Thanks to its factory design, it ensures proper cooperation with the washer pump and hoses, which translates into stable wiper operation and effective visibility maintenance in difficult weather conditions.

Specifications and technical data

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

Purpose and function in the washer system

The presented washer fluid reservoir is a component from the Other wiper parts group, responsible for storing the working medium for the windshield washer system. Its task is to provide adequate working capacity and stable fluid delivery to the pump, and subsequently to the washer nozzles, without the risk of air locks or uncontrolled leaks.

The original design for the Mercedes Vito W639 means proper fitment to the factory mounting points in the body, which facilitates installation and minimizes the risk of material stress. The reservoir works with the standard washer installation, maintaining the factory hose geometry and correct positioning of the connection ports.

Construction and fitment for Mercedes Vito W639

The reservoir has been designed specifically for the Vito W639 platform, thanks to which it maintains the correct geometry for the engine bay and body elements. A properly formed housing allows for:

• stable mounting in the original body brackets,
• proper routing of washer fluid hoses,
• collision-free cooperation with adjacent components in the engine bay.

Such fitment limits the risk of vibrations, rubbing against other elements, and leaks resulting from improper installation. For the user, this means predictable, repeatable operation of the washer system in daily use.

Characteristics of the used component

The offered reservoir is a used part, sourced from dismantling, which is a beneficial solution for users looking for a factory component at a reasonable price. An element of this type allows maintaining the original vehicle specification while reducing repair costs compared to new replacements.

Choosing a used washer fluid reservoir is particularly important for vehicles used intensively, where functionality, proper fitment, and compatibility with the factory installation matter. It is a practical solution for post-accident repairs, mechanical damage, or cracks resulting from operation in low temperatures.

Benefits of using an original reservoir

Using an original washer fluid reservoir in a Mercedes Vito W639 brings a number of practical benefits:

• Factory fitment – maintaining original geometry and mounting points, without the need for modifications.
• Consistency with the wiper system – proper cooperation with the pump, hoses, and washer nozzles.
• Stable operation in various conditions – reducing the risk of system air locks and fluid delivery problems.
• Reasonable repair cost – a used OEM element is a compromise between quality and budget.

For workshops and individual users, this means faster repair completion and a lower risk of complaints related to poorly fitted replacements.

If you are planning a comprehensive repair or modernization of the area responsible for windshield cleaning in your Mercedes and need other elements from the same group, such as wiper arms, washer nozzles, or hose routing mounts, check the available parts in the Other Mercedes wiper parts category.

Part selection and technical support

When selecting a washer fluid reservoir for a specific body and engine version, it is worth paying attention to compatibility with the mounting system and washer installation configuration. Comparing the shape and placement of the ports with the currently installed element can be helpful, which facilitates assessing compatibility before installation.

If you are simultaneously working on the drivetrain or planning a wider range of service, practical tips regarding component selection may be useful. In this context, it is worth reading the guide Clutch and dual-mass flywheel – diagnostics and selection of parts for the drivetrain system, which helps to organize the process of planning repairs and replacements in the car.