Window Seal Mercedes W221 V221 Long Guide Door Rear Left N/S Sealing A2217356525

The Mercedes W221 V221 Rear Left Door Window Seal is an original body part from the Window Seals and Trim group, designed for installation in the rear left door. Its precisely fitted sealing profile helps reduce noise, improves cabin acoustics, and protects the interior from water and dirt.

Specifications and technical data

• SKU: A2217356525
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2217356525
• Substitutable numbers: A2217356525, A 221 735 65 25, KD
• Location on the vehicle: Rear, Left
• Category: Window Seals, Gaskets & Trims

Purpose and Function of the Seal

This seal is dedicated to the rear left door area of the Mercedes W221/V221 body. Its purpose is to create a tight seal between the window and the door frame, preventing moisture, dust, and drafts from entering the vehicle's interior. Thanks to its specific profile and fit for the particular body model, this part helps maintain the window's stable position in the guide and reduces unwanted vibrations during driving.

Construction and Body Fitment

The seal is designed to be structurally compliant with Mercedes' factory standards. The cross-sectional shape and the geometry of the entire perimeter are adapted to the lines of the rear left door and window, facilitating installation and ensuring proper adhesion to both metal and glass surfaces. The appropriately selected material flexibility allows for compensation of minor body deformations, maintaining a seal under typical operating conditions.

Proper fitment of this seal contributes to:

• reducing wind noise at higher speeds,
• minimizing the risk of water leaks around the window,
• stabilizing the operation of the window lift mechanism,
• maintaining the aesthetic line where the window meets the door frame.

Benefits of Using an Original Seal

Using a part from the same design family as Mercedes' factory components ensures technical consistency throughout the door system. Original fitment minimizes the need for modifications and reduces the risk of improper adhesion, which could lead to noise, window fogging, or water ingress. This is particularly important for luxury sedans, where acoustic comfort and cabin sealing are crucial for daily use.

This seal, being a dismantled part, allows for economical repairs while maintaining a construction consistent with the manufacturer's solutions. For many users, this represents a sensible compromise between cost and maintaining proper quality standards.

Installation Area and Practical Tips

The part is intended for installation in the rear left section of the vehicle, within the door and window area. When replacing it, pay attention to:

• thoroughly cleaning the contact surfaces of old seal residue and dirt,
• checking the condition of the door frame and window edges for mechanical damage,
• correctly positioning the seal around the entire perimeter without twists or tension,
• testing the window operation after installation – smooth movement and no rubbing against edges.

This approach allows for full utilization of the part's potential and restores proper sealing in the rear cabin area.

Part Selection and Additional Information

Before purchasing, it is advisable to compare the shape and profile of the seal with the part currently installed in your vehicle, especially if the car has undergone previous body repairs or window replacements. Verifying compatibility with Mercedes service documentation may also be helpful to ensure the selected component matches your specific body version.

If you are planning a comprehensive repair or upgrade of the window and door area in your Mercedes and require other parts from the same group, such as additional seals, trim strips, or window guide components, check the available parts in the Mercedes Window Seals and Trim category.

When considering the purchase of used parts, practical comparisons of new and used solutions may be useful – you can find more information on this topic in the article Car Parts – New or Used? Comparing Costs, Quality, and Durability.