Mercedes W166 Front Window Outer Weather Strip Rail Seal Left N/S A1667252900

Mercedes W166 Front Window Outer Weather Strip Rail Seal Left N/S is an original body component from the Window seals and trims group, designed for installation on the front left door. It ensures effective water removal from the glass surface, stabilizes its movement, and limits the ingress of contaminants into the door interior, which contributes to a longer service life of the window regulator mechanism.

Specifications and technical data

• SKU: A1667252900
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1667252900
• Substitutable numbers: A1667252900, A 166 725 29 00
• Location on the vehicle: Front, Left
• Category: Window Seals, Gaskets & Trims

Purpose and technical function

The presented weather strip seal has been designed specifically for the W166 series body and is installed in the front left door area. Its tasks include:

• draining water from the glass surface during raising and lowering,
• limiting the ingress of dust, mud, and road salt into the door interior,
• stabilizing the glass edge in the guide, which reduces the risk of unwanted vibrations and noise,
• helping to maintain a seal around the lower edge of the glass.

Thanks to its fitment for the specific body model, the seal works with the factory door line, maintaining proper geometry and pressure against the glass.

Benefits of using an original weather strip seal

Using an original component dedicated to the Mercedes W166 allows for maintaining the factory operating parameters of the window mechanism and the aesthetics of the door finish. Key advantages include:

• Precise fit to the shape of the door frame and glass thickness, which facilitates installation and reduces the need for additional adjustments.
• Properly selected stiffness and flexibility of the profile, ensuring even pressure along the entire length of the glass edge.
• Reducing the risk of accelerated corrosion inside the door thanks to better drainage of water and contaminants.
• Improving acoustic comfort by reducing wind noise in the window area.

Choosing an original weather strip seal is particularly important in vehicles equipped with electric window regulators, where proper glass guidance affects the motor load and the durability of the entire mechanism.

Installation characteristics and condition of the item

The seal is intended for installation at factory mounting points on the front left door, without the need for interference with the body structure. The profile is shaped for the specific door line, which allows for:

• installation along the edge of the window frame while maintaining proper adhesion,
• correct interaction with the glass throughout its full range of motion,
• maintaining a consistent appearance with other door trim elements.

The item comes from dismantling, which means it is a used part that retains functionality suitable for further use in a vehicle. This type of solution is beneficial both economically and from the point of view of reducing resource consumption.

Support for the circular economy

Choosing a used weather strip seal is not only a sensible service decision but also a real contribution to reducing waste and reusing functional components. If you want to learn more about the benefits of installing dismantled parts and their impact on the environment and car maintenance costs, check out the article Circular economy in your garage – how choosing used parts from dismantling really supports environmental protection and your wallet?.

Related Mercedes window seals and trims

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