Door Seal Mercedes W212 Window Guide Rear Right O/S Sealing A2127350425

The Mercedes W212 Rear Right Door Window Seal is a precisely fitted body component designed for the rear right door window. It ensures a tight seal between the window and the door frame, contributing to improved acoustic insulation, protection against moisture, and stable operation of the window regulator mechanism. This is a practical solution for owners looking to restore the factory functionality and comfort of their Mercedes.

Specifications and technical data

• SKU: A2127350425
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2127350425
• Substitutable numbers: A2127350425, A 212 735 04 25, KZ
• Location on the vehicle: Rear, Right
• Category: Door Seals

Window Seal Purpose and Function

The offered seal is dedicated to the rear right door window in W212 series models, ensuring proper window guidance and pressure along the entire frame. This component stabilizes the window during opening and closing, reduces vibrations, and minimizes the risk of unwanted noises during driving.

Thanks to its precisely contoured design, the seal helps maintain cabin airtightness, reducing the ingress of water, dust, and drafts into the vehicle's interior. This directly impacts acoustic comfort, upholstery protection, and the durability of electrical components located within the door.

Benefits of Using an Original Door Seal

Using an original seal for the rear right door maintains compliance with factory body assembly tolerances. Proper fit translates to:

• correct window guidance in the channels,
• reduction of wind noise at higher speeds,
• better protection against window fogging at the edges,
• stable cooperation with the window regulator mechanism.

A correctly chosen seal from the Door Seals category also helps minimize the risk of corrosion around the lower door edges by limiting the ingress of water and contaminants into the structure.

Installation and Operational Characteristics

The seal designed for the rear right side of the vehicle is profiled to the specific geometry of the Mercedes W212 door, facilitating installation and ensuring the factory-like fit to the window. A correctly installed component requires no additional modifications and integrates seamlessly with the existing window mechanism and door trim.

During operation, the seal contributes to everyday driving comfort by reducing noise and drafts, and enhancing the subjective feeling of a solid door closure. This is particularly important in premium vehicles where airtightness and the refinement of moving parts are key usability aspects.

Application in Bodywork Service and Repairs

This type of component is frequently replaced during body and paint work, after side collisions, during door adjustments, or when the existing seal has become worn, hardened, or deformed. Replacement restores original sealing parameters and improves the overall quality of the side body finish.

If you are planning comprehensive repairs or upgrades to the door area of your Mercedes and require other parts from the same group, such as perimeter seals, window frame seals, or additional sealing profiles, check the available parts in the Mercedes Door Seals category.

Practical User Tips

When planning a seal replacement, it's advisable to check the condition of the window, guides, and regulator mechanism – a coordinated inspection of these components helps avoid repeated disassemblies in a short period. It is also good practice to periodically clean the window edges and the seal itself of sand and dirt particles, which reduces mechanical wear and improves the smoothness of window operation.

For drivers planning broader service work on their vehicle and aiming to optimize operating costs, the following guide may be helpful: TOP 10 Most Frequently Replaced Parts in Your Car.