Mercedes W251 Window Seal Door Rear Left N/S Sealing Gasket Frame A2517350825

Mercedes W251 Window Seal Door Rear Left N/S Sealing Gasket Frame is an original body component from the Window seals and trims group, designed for installation in the rear left door. The precisely fitted rubber profile ensures stable glass seating, reduces wind noise, and supports the proper operation of the window regulator mechanism.

Specifications and technical data

• SKU: A2517350825
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2517350825
• Substitutable numbers: A2517350825, A 251 735 08 25
• Location on the vehicle: Rear, Left
• Category: Window Seals, Gaskets & Trims

Purpose and function of the seal

The presented seal is dedicated to the rear left door area in W251 series models, where it is responsible for the tight guidance of the window and separating the interior from external factors. Thanks to the properly shaped rubber cross-section, the element stabilizes the edge of the glass in the guide, which translates into smooth closing and reduction of lateral play.

Its placement in the rear part of the body means that the seal operates in an area particularly exposed to dirt and moisture, which is why its proper condition is important for acoustic comfort, protection of the upholstery, and the durability of internal door components.

Benefits of using an original Mercedes seal

Using a factory seal in the rear left door allows for maintaining compliance with the body structure and parameters provided by the manufacturer. Key advantages include:

• Precise fit to the door frame – reduction of installation stress and the risk of leaks.
• Stable vertical glass guidance, which promotes even operation of the window regulator.
• Reduction of wind noise at higher speeds thanks to proper pressure against the glass.
• Better protection of the door interior against water and dust, which supports the durability of the mechanisms.

Choosing an original Mercedes component is particularly important in the case of rubber parts, where the profile geometry and material hardness directly affect the tightness and comfort of use.

Installation and operational characteristics

The rear left window seal is designed as an element matched to the specific geometry of the door, which facilitates installation and allows for the restoration of the factory contact line with the glass. Properly installed rubber works with the door frame and the glass, creating a continuous barrier against water and noise.

During operation, this element works through cycles of opening and closing the window, which is why its replacement upon visible signs of wear (cracks, loss of elasticity, leaks) is recommended to maintain the appropriate level of driving comfort and protection of the vehicle interior.

Component condition and service application

The offered seal is in used condition, making it a service solution for users looking for an original component at a reasonable price. This type of part is suitable for post-accident repairs, replacement after glass removal, or when eliminating leaks within the rear left door.

The selection of the correct seal for a specific vehicle should be verified based on the car's technical data to ensure full compatibility with the door structure and window mechanism.

Modernization expansion within windows and doors

If you are planning a comprehensive repair or modernization of the window and door area in your Mercedes and need other elements from the same group, such as additional seals, trim strips, or window guides, check the available parts in the Mercedes window seals and trims category.

For owners of vehicles of this brand interested in a broader approach to maintaining the car in good technical condition, the article describing the refreshment of the power unit may also be helpful – more information can be found in the material Second life of the Mercedes OM642 engine – how injectors and turbocharger restore the power of the 3.0 V6 CDI.