Mercedes W205 Door Trim Rear Left N/S Window Frame Black A2057370171

Mercedes W205 Door Trim Rear Left N/S Window Frame Black is a precisely fitted body component designed for the rear left door window in W205 series models. It is responsible for guiding the window securely, reducing noise, and protecting against moisture, which translates into stable window mechanism operation and acoustic comfort inside the vehicle. Thanks to its factory geometry, the seal maintains the correct door line and an aesthetic appearance of the side body section.

Specifications and technical data

• SKU: A2057370171
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2057370171
• Substitutable numbers: A2057370171, A 205 737 01 71
• Location on the vehicle: Rear, Left
• Color: Black
• Category: Trim

Purpose and function of the component

The described window frame trim seal is dedicated for installation in the rear left door of Mercedes W205 class vehicles. The component guides the edge of the glass within the door frame, stabilizes its position during raising and lowering, and reduces vibrations while driving. A correctly selected seal contributes to:

• maintaining a seal between the glass and the door frame,
• reducing wind noise at higher speeds,
• protecting the interior of the door against excessive water and dirt ingress,
• maintaining the proper geometry of the window guidance.

Construction, color, and fitment

The seal features a design adapted to the factory profile of the door frame in the Mercedes W205, which ensures secure seating in the slot and even pressure against the glass along its entire length. The black color is consistent with the typical finish of door frames in this model, allowing the component to blend harmoniously with other trims and decorative moldings.

Properly contoured edges facilitate installation in the original mounting points, and the appropriately selected material stiffness allows the shape to be maintained through repeated window operation cycles. This solution is particularly beneficial for used vehicles, where stability and repeatability of the lifting mechanism are important.

Benefits of using an original seal

Using a dedicated window frame trim seal in the Mercedes W205 allows for reducing the risk of leaks and improper window guidance, which often occur with universal parts. The main advantages include:

• Factory fitment to the door frame – no need for modifications or trimming the profile.
• Consistent appearance with other body elements – black shade matching the typical window frame finish.
• Stable window operation – reduction of jamming, rattling, and excessive play in the guides.
• Better protection of the door interior – lower risk of water and dirt accumulation in the lifting mechanism area.

Use in repairs and upgrades

The component is suitable both for standard replacement of a worn seal and for more extensive bodywork and paint repairs in the area of the rear left door. Replacing a worn window frame trim is recommended, among other things, when excessive noise appears in the door area, there are problems with closing the window, or visible damage to the rubber is present.

If you are planning a comprehensive repair or upgrade of the door area in your Mercedes and need other components from the same group, such as trims, decorative moldings, or decorative frame finishes, check the available parts in the Mercedes trims, decorative moldings, and decorations category.

Practical installation and maintenance tips

When installing the window frame trim seal in a Mercedes W205, it is worth paying attention to thoroughly cleaning the slots in the door and checking the condition of the window guides. A correctly seated seal should adhere evenly along its entire length, without twists or excessive tension. After installation, it is recommended to fully lower and raise the window several times to verify smooth operation.

For drivers interested in a broader context of selecting used components for a car, including assessing the cost-effectiveness of repairs, the guide article Used gearbox – when is it worth it and what you need to remember, which discusses practical aspects of choosing parts from the secondary market, may be helpful.