Mercedes-Benz E-Class S210 Rear Left Door N/S Window Rail Guide Seal Gasket

The Mercedes S210 left door window seal is a precisely profiled component from the Door Seals group, designed for the rear, left side of the body. It ensures a tight window seal, reduces noise, and protects the interior from water and dirt, directly impacting driving comfort and upholstery durability.

Specifications and technical data

• SKU: A2107350325
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2107350325
• Substitutable numbers: A2107350325, A 210 735 03 25, EM
• Location on the vehicle: Rear, Left
• Category: Door Seals

Seal Purpose and Function

The presented seal is designed for installation in the rear, left door window of the S210 series estate body. Its purpose is to provide stable window guidance in the tracks and maintain proper pressure against the glass during opening and closing, which translates to quiet operation of the lifting mechanism.

A well-chosen window seal limits moisture ingress into the door, reduces the risk of corrosion to bodywork and window regulator components, and improves cabin acoustic insulation. This is particularly important in premium vehicles where a high level of driving comfort is expected.

Benefits of Using an Original Seal

Using an original seal dedicated to a specific body model ensures:

• precise fit to the shape of the door frame and window,
• stable seating in factory mounting points,
• correct cooperation with the window lifting mechanism,
• maintenance of the factory interior soundproofing level.

Thanks to this, replacing a worn-out part with the correct seal restores original tightness and driving comfort without the need for additional modifications or adjustments.

Installation Characteristics

The seal is designed for installation on the rear, left side of the body, eliminating the risk of choosing the wrong side. The design intended for factory mounting points facilitates service work and reduces replacement time. With correct installation, uniform pressure can be achieved around the entire perimeter of the window, minimizing air noise during driving.

This part is from a dismantled vehicle, making it a sensible choice for maintenance repairs where preserving original geometry and compatibility with other door components is a priority.

Practical Service Application

Window seal replacement is recommended in situations where:

• noticeable air noise occurs at higher speeds,
• signs of water leaks are present around the rear left window,
• increased resistance is felt in the window lifting mechanism,
• visible cracks, deformations, or hardening of the rubber are observed.

Choosing the correct part from the Door Seals group helps avoid issues with the window not closing properly, accelerated wear of the window guides, and unwanted vibrations during driving.

If you are planning a comprehensive repair or upgrade of the door area in your Mercedes and need other parts from the same group, such as perimeter seals, frame seals, or additional soundproofing profiles, check the available parts in the Mercedes Door Seals category.

To better plan bodywork service and prepare your vehicle for tougher operating conditions, it is worth using the practical tips contained in the article “Winter Essentials: Which Used Car Parts Are Worth Checking and Replacing Before the Frost?”, where you will find checklists and advice on selecting used components.