Mercedes W166 Door Window Frame Guide Rail Seal Rubber Rear Left N/S A1667350925

Mercedes W166 Door Window Frame Guide Rail Seal Rubber Rear Left N/S is a precisely fitted body component responsible for guiding the window securely and ensuring a tight seal within the door frame. Thanks to its factory-spec geometry and compatibility with the rear left door design, it ensures proper operation of the window regulator mechanism and prevents water and noise from entering the vehicle interior.

Specifications and technical data

• SKU: A1667350925
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1667350925
• Substitutable numbers: A1667350925, A 166 735 09 25
• Location on the vehicle: Rear, Left
• Category: Window Seals, Gaskets & Trims

Purpose and function in the bodywork

The presented window frame guide rail seal has been designed specifically for installation in the rear left door of Mercedes W166 class vehicles. Its task is to guide the edge of the glass along the door frame, stabilize the window's movement during opening and closing, and contribute to the sealing barrier between the glass and the bodywork.

The properly selected flexibility of the rubber and the profile of the guide rail contribute to:

• reducing window vibrations while driving,
• reducing wind noise at higher speeds,
• minimizing the risk of scratching the glass edges,
• draining water away from the inside of the door.

Construction and material properties

The seal is made of profiled rubber with controlled hardness, adapted to operate in varying temperature and humidity conditions. The guide rail construction includes a precisely shaped channel in which the edge of the glass moves, allowing for the maintenance of the correct geometry of its movement relative to the door frame.

Key performance features:

• stable window guidance throughout its entire range of motion,
• maintaining peripheral sealing in the contact zone between the glass and the frame,
• resistance to typical operational loads, such as frequent window opening and closing cycles.

Benefits of using an original Mercedes component

As an item from the Window seals and trims group dedicated to Mercedes, this rear left window frame guide rail ensures compliance with factory assembly tolerances. Proper fitment to the shape of the door and window frame translates into:

• correct adhesion to the door structure without the need for modifications,
• maintaining the manufacturer-designed body line in the window frame area,
• consistency with other seals and trims used in the vehicle.

Choosing an original component from dismantling allows you to maintain the quality of bodywork fitment characteristic of Mercedes, while simultaneously optimizing service costs.

Condition, installation, and service application

The item comes from a used vehicle and is intended for re-installation in the rear left door of the appropriate Mercedes W166 model. This type of window frame guide rail seal is particularly useful for:

• eliminating leaks in the rear left door window area,
• repairs after collisions in the door and window frame zone,
• eliminating rattles, knocks, or excessive window play while driving.

Due to its factory fitment, installation is based on the original mounting points in the door, which facilitates service work and reduces repair time.

Service expansion and knowledge about used Mercedes parts

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

To better plan the use of original components from dismantling in your car, it is worth familiarizing yourself with practical tips regarding the selection and operation of used Mercedes subassemblies – detailed information can be found in the article Used parts for Mercedes – original parts from dismantling.