Mercedes W166 Panoramic Sunroof Sliding Roof Window Glass Panel Tinted AS3

Mercedes W166 Panoramic Sunroof Sliding Roof Window Glass Panel Tinted AS3 is an original component from the Panoramic roofs, sunroofs and parts category, designed for installation in the front section of the vehicle. The AS3 tinted glass pane provides pleasant interior illumination while reducing cabin heating and glare. This is a solution for users who want to maintain the factory functionality of the panoramic roof and a consistent body appearance.

Specifications and technical data

• SKU: A1667800021
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1667800021
• Substitutable numbers: A1667800021, A 166 780 00 21
• Location on the vehicle: Front
• Category: Sunroofs & Parts

Purpose and function in the vehicle

The presented glass panel is designed for installation in the front section of the panoramic sunroof in the Mercedes W166 class. As a moving element, it is responsible for the roof opening capability, cabin ventilation, and the smooth operation of the entire sliding mechanism. The use of AS3 standard glass ensures properly selected light transmission and radiation protection, which translates into stable thermal conditions inside the vehicle.

Construction and technical properties

The panoramic roof glass in this version features factory tinting, which improves driving comfort on sunny days and reduces fatigue for the driver and passengers. The panel design is adapted to factory rails and seals, which facilitates correct positioning and ensures tightness after installation. The use of original edge geometry and mounting points allows for precise fitting with the roof frame and other body elements.

Benefits of using the original glass panel

Choosing an original sliding panoramic roof glass for the Mercedes W166 primarily offers:

• preservation of the factory body line and aesthetics of the glass roof,
• reliable fitment to existing rails and the sliding mechanism,
• properly selected light transmission and tint level,
• stable roof operation at higher speeds due to the correct glass rigidity.

The used element allows for repair cost optimization while maintaining characteristics similar to installing a new factory part, which is particularly important during major body and glazing repairs.

Condition, fitment, and installation

The glass panel comes from dismantling and is intended for reinstallation in a vehicle where restoring the functionality of the sliding roof is required. Placement in the front zone requires precise adjustment relative to the frame and mechanism, which is why installation in a specialized service center dealing with panoramic roofs and sunroofs is recommended. Using original glass facilitates clearance adjustment, closing, and proper water drainage from the roof channels.

Expanding the panoramic roof system in Mercedes

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 rails, cassettes, or seals, check the available parts in the Panoramic roofs, sunroofs and parts Mercedes category.

Safety and quality of used OEM parts

When choosing used panoramic roof glass, it is worth paying attention to the origin and compliance with the manufacturer's factory standards. Original components maintain the strength and optical parameters intended for a given model, which is important for both comfort and driving safety. If you want to better understand why used OEM elements are a rational choice for body and glazing repairs, read the article Quality guarantee and OEM safety – why used original car parts are the best choice for your car?.

For drivers who are also considering repairs within the drivetrain and want to compare the cost-effectiveness of used factory elements with replacements, the guide Humming differential? Find out why a used OEM drive axle is a better investment than an uncertain replacement, showing the broader economic and technical context of using original parts, will be helpful.