Mercedes Vito W639 Panoramic Sunroof Sliding Roof Rear Window Glass Tinted AS3

Mercedes Vito W639 Panoramic Sunroof Sliding Roof Rear Window Glass Tinted AS3 is an original body component designed for vehicles equipped with a glass roof. The tinted glass with AS3 specification provides increased thermal comfort and reduces sunlight penetration into the interior, improving travel conditions for passengers in the rear of the cabin. This solution is particularly valued in commercial and passenger vehicles that often operate in varied lighting conditions.

Specifications and technical data

• SKU: A6397800205
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6397800405
• Substitutable numbers: A6397800405, A 639 780 04 05
• Location on the vehicle: Rear
• Category: Other Exterior Parts & Accessories

Purpose and function in the vehicle

The presented rear panoramic sunroof glass is dedicated to the Mercedes Vito W639 model with a factory-fitted sliding glass roof. The component is mounted in the rear part of the roof, in the area above the passenger or cargo space, depending on the body configuration. As an integral component of the roof system, it is responsible for:

• maintaining the tightness and rigidity of the roof structure,
• proper guidance and cooperation with the sliding mechanism,
• controlling the amount of light entering the interior thanks to the tinting,
• passive safety in accordance with the AS3 glass class.

Technical characteristics of the glass

The panoramic glass has been manufactured as tempered automotive glass with increased resistance to operational stress. The applied tinting reduces interior heating, which is particularly beneficial in vehicles used in urban traffic, passenger transport, or during long stops. The design is adapted to work with the factory guide and seal system of the sliding roof, which facilitates installation and subsequent adjustment.

The original origin of the component helps maintain the correct roof geometry and proper adhesion to the frame, which minimizes the risk of leaks and unwanted noise while driving. As a result, the glass fits well with the requirements of users expecting stable, predictable operation of the roof mechanism.

Condition, fitment, and installation

The item comes from dismantling and is offered as a used part, which allows for economical repair while maintaining the manufacturer's original specification. The glass is intended for installation in the rear part of the roof, in place of the factory panoramic glazing. In practice, this means the possibility of directly replacing a damaged element with a component of identical geometry and mounting method.

Installation in a specialized body and glass repair shop or a workshop dealing with sliding roof installations is recommended, which allows for proper setting of clearances, tightening of mounts, and leak testing after installation. Properly installed glass restores the full functionality of the panoramic roof without the need for interference with the body structure.

Use of original used parts

Choosing an original, used panoramic glass for the Mercedes Vito W639 is beneficial both in technical and economic terms. Maintaining the factory specification of the glass, shape, and mounting method helps maintain the structural integrity of the roof and reduces the risk of fitment issues that may occur with some aftermarket replacements. For users planning to sell the vehicle in the future, the use of original components can be an additional argument confirming a properly performed repair.

If you want to analyze more broadly the impact of original parts on the resale value of a car, it is worth reading the guide material on original used parts and their importance for vehicle price, which discusses the practical aspects of selecting components during repairs.

Expansion of configuration and technical knowledge

Owners of commercial and passenger vehicles are often interested in the differences in body, suspension, or drivetrain construction between standard versions and more advanced variants. For a comparison of technical solutions used in sports models of another brand, including engines, brakes, and chassis, the article comparing the Audi RS series with other versions may be helpful, showing how manufacturers differentiate specifications within a single model range.

If you are planning a comprehensive repair or modernization of the roof area in your Mercedes and need other elements from the same group, such as seals, guides, or additional modules related to the roof, check the available parts in the Other Mercedes category.