Mercedes-Benz S W221 Panoramic Sunroof Sliding Roof Front Window Glass Panel AS3

Mercedes-Benz S W221 Panoramic Sunroof Sliding Roof Front Window Glass Panel AS3 is an original glass component designed for the factory panoramic roof system in this model. Thanks to its precise fit to the body structure and the AS3 glass standard, the panel ensures proper performance parameters and compatibility with the factory roof mechanism. This is a solution for users who want to restore the full functionality and aesthetics of the panoramic roof in their Mercedes.

Specifications and technical data

• SKU: A2217800521
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2217800521
• Substitutable numbers: A2217800521, A 221 780 05 21, BG
• Location on the vehicle: Front
• Category: Other Exterior Parts & Accessories

Purpose and function of the glass panel

The described panel is the front glass section of the panoramic sliding roof in the Mercedes S-Class W221 generation, mounted in the front part of the roof. The component works with the factory guide and seal mechanism, responsible for cabin illumination, driving comfort, and the proper operation of the tilt and slide roof functions.

The AS3 type glass used in such panels provides an appropriate level of tinting and light filtration, which reduces interior heating and improves passenger comfort. At the same time, it maintains the transparency necessary for safe vehicle operation in accordance with the manufacturer's requirements.

Compatibility with Mercedes-Benz S-Class W221

The panel has been designed specifically for the panoramic roof system in the Mercedes-Benz S-Class W221, which means compatibility with factory mounting points, dimensions, and body geometry. This allows for maintaining:

• proper fitment with the roof frame and seals,
• correct operation of the sliding and tilting mechanism,
• a consistent stylistic line of the vehicle's roof and windows.

The original origin of the component facilitates trouble-free installation in place of a damaged panel, without the need for modifications to the roof structure or guides.

Characteristics of the AS3 panoramic glass

The AS3 type panoramic glass used in this panel is designed with the comfort and safety of luxury limousine users in mind. In practice, this means:

• increased resistance to mechanical damage compared to standard glass,
• controlled light and solar energy transmittance,
• maintaining the appropriate structural rigidity of the roof in the glazing zone.

Thanks to this, the panoramic roof retains its functional qualities while not compromising the thermal comfort inside the vehicle.

Condition of the component and installation aspects

The offered panel is a used component, sourced from disassembly, which allows for an economical replacement of damaged glass while maintaining the original manufacturer's specifications. This type of solution is particularly beneficial in the case of advanced panoramic roof systems, where dimensional and structural fit is of key importance for tightness and the correct operation of the mechanism.

During installation, it is recommended to use the services of a workshop experienced in handling Mercedes-Benz panoramic roofs, which will allow for proper panel alignment, guide adjustment, and tightness inspection after replacement.

Expansion of roof and body modernization

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 additional glass panels, seals, or sliding mechanism components, check the available parts in the Other Mercedes category.

To better understand the differences in the construction of advanced premium model versions, including extensive body and chassis systems, it is worth reading the analysis of Audi sports variants – you will find it in the article Audi RS vs other models – what is hidden under the hood and chassis?, which shows how manufacturers design components to work in demanding conditions.

If you want to shorten the vehicle's downtime in the service and want to better plan the replacement of panoramic roof elements, the guide on the logistics of used parts and a wide assortment from one warehouse may also be helpful: how a wide assortment in one warehouse actually shortens your car's downtime at the mechanic.