Mercedes W251 Panoramic Sunroof Sliding Roof Front Window Glass Panel Tinted AS3

Mercedes W251 Panoramic Sunroof Sliding Roof Front Window Glass Panel Tinted AS3 is an original, AS3-tinted glass panel designed for the factory panoramic sunroof. This component provides comfortable cabin illumination and enhances the sense of space, while the tinting reduces interior heating and glare, contributing to driving comfort and safety.

Specifications and technical data

• SKU: A2517800121
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2517800121
• Substitutable numbers: A2517800121, A 251 780 01 21
• Location on the vehicle: Front
• Category: Sunroofs & Parts

Application and vehicle function

The described glass panel serves as the front section of the glass roof in Mercedes W251 class models, mounted in the roof area above the first row of seats. As an integral part of the panoramic sunroof, it is responsible for:

• illuminating the front part of the cabin while maintaining thermal comfort,
• proper interaction with the sliding mechanism and seals,
• structural rigidity of the roof assembly in the front zone,
• protection against wind and noise when the roof is open.

Thanks to the use of AS3-grade glass, the panel provides an appropriate level of light transmission and radiation filtration, which is particularly important during long-term vehicle operation.

Construction and technical specifications

The Mercedes W251 Panoramic Sunroof Sliding Roof Front Window Glass Panel Tinted AS3 has been designed as a component dedicated to the specific roof construction of the Mercedes W251. This means:

• precise fitment to the roof frame and sunroof guides,
• factory-profiled edges that interface with the seals,
• maintenance of the correct geometry for proper closing and sealing,
• tinting optimized for the comfort of front-row passengers.

Such a solution allows for maintaining the factory operating parameters of the sliding mechanism and system tightness, which is significant for both comfort and protecting the interior from moisture.

Condition of the item and benefits of choosing a used part

The offered glass panel belongs to the Panoramic roofs, sunroofs and parts category and is a used item, which allows for a significant reduction in repair costs compared to a new glass panel. In the case of such components, it is crucial to maintain:

• correct glass geometry,
• compatibility with factory guides and frame,
• compliance with the manufacturer's original production standard.

Choosing an original, used roof glass for a Mercedes allows you to maintain the structural integrity of the roof and avoid fitment issues that may occur with aftermarket replacements of uncertain origin.

Selection and installation in the front zone

The panel is intended for installation in the front part of the roof, in place of the factory sliding panoramic window. When planning a replacement, it is worth paying attention to:

• compatibility of the body version and roof type with your vehicle,
• condition of the sunroof frame and guides before installing the new glass,
• proper alignment and adjustment of the mechanism after installation.

Professional installation allows for restoring the full functionality of the panoramic roof, including smooth opening and closing as well as sealing in the front zone.

Knowledge expansion and related categories

To better plan the operation and service of your car, it is worth learning about the impact of choosing used parts on repair costs and component durability – a practical comparison of factory solutions can be found in the article Volkswagen 1.9 TDI vs 1.4 TSI – evolution of VW engines and repair costs, which shows how to optimize service expenses using components from the secondary market.

If you are planning a comprehensive repair or upgrade of the roof area in your Mercedes and need other elements from the same group, such as guides, seals, or additional glass panels, check the available parts in the Panoramic roofs, sunroofs and parts Mercedes category.