Mercedes X164 W251 Sunroof Sliding Roof Front Window Glass Panel Tinted AS3

Mercedes X164 W251 Sunroof Sliding Roof Front Window Glass Panel Tinted AS3 is an original, tinted AS3 glass panel designed for the factory sliding roof system. This component has been specifically engineered for Mercedes X164 and W251 class models, ensuring a precise fit, high sealing performance, and smooth mechanism operation. It is a practical solution for drivers and workshops in need of a proven, used component for professional repair or replacement of a damaged sunroof glass.

Specifications and technical data

• SKU: A2517800021
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2517800021
• Substitutable numbers: A2517800021, A 251 780 00 21
• Location on the vehicle: Front
• Category: Sunroofs & Parts

Application and function of the glass panel

The front sunroof glass panel is responsible for cabin illumination, protection against external elements, and proper interaction with the roof system's guides and seals. The presented solution features AS3 class tinted glass, which reduces interior heating, improves driving comfort on sunny days, and minimizes glare. The positioning of the element in the front roof zone makes it crucial for the ergonomics of the sunroof – both in tilt and slide modes.

Compatibility with the body and sunroof system

The panel has been constructed with the factory Mercedes roof system in X164 and W251 versions in mind, which translates into:

• maintaining the original geometry of edges and mounting points,
• compatibility with factory guides and the sunroof cassette,
• proper adhesion to seals and the roof frame.

Thanks to this, replacing a damaged glass with an original glass panel allows for the restoration of factory mechanism performance parameters, without the need for structural roof modifications or bodywork interference.

Characteristics of AS3 tinted glass

The AS3 type tinted glass used in this panel provides increased thermal and visual comfort. This type of glass:

• limits the penetration of solar radiation into the vehicle interior,
• improves glare protection, especially in intense sunlight,
• supports passenger privacy in the front part of the cabin.

At the same time, adequate transparency is maintained, allowing for safe use of the sunroof in various road conditions.

Condition, origin, and benefits of choosing a used part

The offered panel is a used original Mercedes component, sourced from dismantling. In practice, this means maintaining factory build quality, dimensional compliance, and compatibility with the roof system of the given model. For workshops and conscious users, choosing such a part is often an optimal compromise between repair costs and maintaining the vehicle's high technical standard.

Before installation, it is recommended to perform a standard inspection of the condition of edges, working surfaces, and cooperating seals and guides to ensure proper tightness and smooth operation of the entire system.

Support with selection and additional information

The selection of the correct sunroof glass panel for a specific Mercedes body version and model year should always be verified based on vehicle data and manufacturer markings. In case of doubt, information regarding part numbers and compatibility with specific X164 and W251 variants is helpful, minimizing the risk of incorrect fitment.

To better plan the purchase and installation of a used roof component, it is worth using the practical tips regarding verification of condition, compliance, and transaction security available in the article Safe purchase of used car parts online – a step-by-step guide, prepared for drivers and service centers.

Related Mercedes roof system components

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