Mercedes W176 Sunroof Sliding Roof Centre Window Glass Panel AS3 Webasto

Visual condition of the part 

The product shows signs of use visible in the photos. 

Mercedes W176 Sunroof Sliding Roof Centre Window Glass Panel AS3 Webasto is an original roof component designed for the W176 generation A-Class models, providing comfortable interior illumination and improved ergonomics. The AS3 panoramic design, developed in collaboration with Webasto, ensures a precise fit to the bodywork and stable operation of the sliding and tilting mechanism. This is a solution for users who expect factory-quality assembly and consistency with the vehicle's equipment.

Specifications and technical data

• SKU: A1767800021
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1767800021
• Substitutable numbers: A1767800021, A 176 780 00 21
• Category: Other Exterior Parts & Accessories

Technical characteristics of the W176 panoramic sunroof

The panoramic sunroof in the W176 model is an integral roof module, including a high-durability glass panel, guide rails, and a support frame integrated with the roof skin. The use of AS3 class glass means appropriately selected light transmission and radiation filtration, which translates into better thermal comfort and reduced cabin heating. The panoramic solution visually increases the space inside the vehicle, improving visibility and the feeling of spaciousness.

The mechanism developed by Webasto ensures smooth movement of the panel in both tilting and sliding modes, while maintaining a tight seal at the contact points with the perimeter gaskets. The module is designed as a component that works with the vehicle's factory electronics, allowing for the retention of control functions from the original switches in the cabin.

Function, safety, and comfort of use

The panoramic roof in the A-Class W176 serves several important roles in daily vehicle operation:

• increases the amount of natural light in the cabin, which improves interior readability and travel comfort,
• enables effective ventilation when the panel is tilted, without the need to fully open the side windows,
• works with factory systems monitoring the sunroof position, which promotes operational safety,
• maintains the aerodynamic consistency of the body, reducing air turbulence and noise at higher speeds.

A properly designed frame and seal profile minimizes water and noise penetration into the interior, and the use of glass with controlled light transmission allows for comfortable driving in both urban conditions and on the road.

Selection and integration with the Mercedes W176 body

Mercedes W176 Sunroof Sliding Roof Centre Window Glass Panel AS3 Webasto is intended for installation in the W176 generation A-Class body, maintaining factory mounting points and roof geometry. This makes it possible to restore the original vehicle configuration after mechanical or collision damage, without the need for aftermarket alternatives. The module is prepared to work with factory headliner upholstery elements, the water drainage system, and the electrical installation controlling the panel movement.

When selecting the component, it is crucial to compare the vehicle's equipment configuration and compatibility with the body version to ensure full control functionality and correct operation of the position sensors. Using an original roof solution allows for maintaining the structural integrity of the body and proper load distribution in the roof area.

Component condition and service application

The offered roof module is a secondary market part, which allows for economical vehicle repair while maintaining the manufacturer's original specifications. This type of component is primarily used for post-accident repairs, replacing damaged roof glass, or restoring full sunroof functionality after a mechanical failure. A properly selected and installed module allows for the restoration of comfort and body aesthetics close to the factory configuration.

Configuration expansion and additional materials

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 roof frames, seals, or additional equipment modules, check the available parts in the Other Mercedes category.

For users interested in comparing technical solutions used in different brands and segments, including sports versions of competing models, the material describing the differences in the construction of powertrains, braking systems, and chassis may be helpful – you can find it in the article Audi RS vs other models – what is hidden under the hood and chassis?.