Mercedes W639 Rear Quarter Window Motor Regulator Left Right N/O/S A6398200542

Mercedes W639 Rear Quarter Window Motor Regulator Left Right N/O/S is a precision component from the Window Regulators and Motors category, responsible for the smooth operation of the rear quarter window in your van. Thanks to its factory design intended for the Mercedes W639, it ensures proper compatibility with the window mechanism and stable performance in daily use. It is a practical solution for users who expect a functional and technically matched replacement part.

Specifications and technical data

• SKU: A6398200542-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6398200542
• Substitutable numbers: A6398200542, A 639 820 05 42
• Location on the vehicle: Rear, Right, Left
• Category: Window Motors & Regulators

Purpose and function in the vehicle

The rear quarter window motor in the Mercedes W639 is responsible for driving the opening and closing mechanism of the window in the rear part of the body. This component works with the window system on the left side, and its design is intended for installation in the rear area, with the possibility of application on the left or right side depending on the body configuration.

As a part from the Window Regulators and Motors category, this component ensures:

• stable power transmission to the window tilting mechanism,
• proper cooperation with the vehicle's electrical system,
• repeatable window movement within the range specified by the manufacturer.

Compatibility and fit for the Mercedes W639

The presented motor has been designed for the Mercedes W639 platform, which translates into correct mounting points and a fit for the factory rear quarter window tilting mechanism. Thanks to this, the installation process is straightforward, without the need for bodywork modifications or wiring alterations.

The appropriate placement on the vehicle (rear, left or right side) allows for flexible application depending on the body version and window configuration. Such a solution facilitates the selection of parts when repairing the window system in the rear zone of the vehicle.

Performance characteristics and advantages of use

The rear quarter window motor in the Mercedes W639, as a pre-owned element, is a reasonable choice for drivers and workshops looking for technically verified solutions on a budget. Using an original component from this group allows you to maintain:

• consistency with the factory window control system,
• correct geometry of the tilting mechanism,
• proper operation of the window in daily use.

For vehicles used intensively – both in private and fleet applications – a functional rear quarter window motor translates into the convenience of ventilating the cargo or passenger space and maintaining the full functionality of the bodywork.

Application in service and window system repairs

Replacing the rear quarter window motor is a typical service operation performed in the event of a loss of window movement smoothness, lack of response to controls, or improper operation of the mechanism. Using the correct element intended for the Mercedes W639 allows you to reduce repair time and minimize the risk of fitment issues.

In workshop practice, it is particularly important that the component from the Window Regulators and Motors group is structurally compatible with the factory solution – this affects the durability of the repair and the stability of the entire system. A pre-owned element of this type can be an effective way to restore the full functionality of the rear window while maintaining reasonable vehicle maintenance costs.

Expanding knowledge and selecting parts

If you are interested in a broader context of operation and potential technical problems in popular models, it is worth reading the guide material regarding BMW E90 power units – you will find it in the article Faulty BMW E90 engines: check what can ruin your budget, which shows how to consciously approach service costs and fault diagnosis.

If you are planning a comprehensive repair or upgrade of the window zone in your Mercedes and need other elements from the same group, such as window drives, lifting mechanisms, or additional control motors, check the available parts in the Mercedes Window Regulators and Motors category.