Mercedes W639 Front Windscreen Window Seal Gasket Rubber Frame A6396710121

Mercedes W639 Windshield Rubber Seal Front is an original part from the Window Seals and Trim group, designed for installation in the front part of the body. It ensures a tight fit of the windshield, stabilization of the frame, and limits the ingress of water, noise, and contaminants into the vehicle's interior. Thanks to its factory profile and precise fit to the body structure, it provides a solid foundation for professional front-end repairs.

Specifications and technical data

• SKU: A6396712020
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6396712020
• Substitutable numbers: A6396712020, A 639 671 20 20
• Location on the vehicle: Front
• Part type: Window Seal
• Category: Window Seals, Gaskets & Trims

Purpose and Technical Function

The windshield frame seal in the Mercedes W639 model is responsible for properly sealing the contact between the glass and the body, as well as for the stable positioning of the windshield edges. This component is installed in the front of the vehicle, where it is exposed to intense weather conditions, making the correct profile and rubber flexibility crucial for maintaining a watertight seal.

Using a seal that matches the factory geometry allows for:

• minimizing the risk of water leaks in the upper and side areas of the windshield,
• reducing wind noise at higher speeds,
• maintaining a stable fit of the windshield in the body frame,
• preserving the correct sealing line to the pillars and cowl.

Construction and Material Properties

The seal is made from flexible rubber material with selected hardness, allowing for a precise fit to the shape of the windshield frame. The working profile is designed for the specific geometry of the Mercedes W639 body, ensuring a uniform contact line with the glass and bodywork around its entire perimeter. Appropriately shaped working edges help to drain water from the upper part of the windshield and limit dirt accumulation in the corners.

Original origin from the Mercedes brand means adherence to factory dimensional tolerances, which facilitates installation and reduces the risk of stress on the glass after it is seated in the frame.

Mounting Area and Service Application

The component is intended for installation in the front part of the vehicle, in the area of the windshield frame. In workshop practice, this type of seal is primarily used for:

• replacing the windshield after mechanical damage or cracking,
• addressing leaks in the upper or side sections of the windshield,
• renovating the front end after bodywork and paint repairs,
• restoring the factory fit geometry of the windshield to the body.

Using an original seal from the Window Seals and Trim group ensures technical consistency with other body components and minimizes the need for additional adjustments during installation.

Condition, Origin, and Benefits of Use

The offered item is a used part, which in workshop practice represents a reasonable compromise between repair cost and maintaining the original manufacturer's specifications. For windshield frame seals, it is particularly important that the profile and geometry match the factory design – using a component from the same body platform facilitates achieving proper sealing after installation.

The main benefits of using this seal include:

• maintaining the factory windshield-to-body sealing line,
• reducing cabin noise resulting from leaks,
• improving protection against water and moisture in the cowl area,
• better windshield stability in the frame during daily use.

Compatibility within Category and Additional Materials

If you are planning a comprehensive repair or upgrade of the body glazing area in your Mercedes and need other parts from the same group, such as additional perimeter seals, trim strips, or guide profiles, check the available parts in the Mercedes Window Seals and Trim category.

For users interested in a broader context of selecting used OEM parts, optimizing repair costs, and the impact of components on vehicle handling, the following guide article may be helpful: Go-Kart Feeling XXL: Used N18 Turbocharger vs. B48 – What to Choose for a Mini Cooper S?. Although it concerns a different vehicle group, it effectively illustrates the approach to conscious selection of used original parts.