Mercedes A-Class W168 Rear Left Door N/S Window Guide Seal Gasket A1687350525

The MERCEDES W168 Rear Left Door Window Seal is a precisely fitted body component designed for the rear left door window of Mercedes vehicles in this series. It ensures a tight seal for the window, reduces noise, and protects the interior from water and dirt, directly contributing to comfortable daily use.

Specifications and technical data

• SKU: A1687350525
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1687350525
• Substitutable numbers: A1687350525, A 1687350525, A 168 735 05 25, ASZ
• Location on the vehicle: Rear, Left
• Category: Door Panels

Purpose and Function of the Seal

This seal is part of the Door Upholstery group, installed in the rear left area of the body. Its purpose is to provide stable guidance for the window within the door frame and maintain proper sealing between the window and the door structure. A correctly fitted seal limits air drafts, reduces wind noise at higher speeds, and helps maintain the cabin's acoustics.

Its placement on the vehicle in the rear left door area makes this component important for both passengers and the overall rigidity and refinement of the entire side body section. Proper seal fit translates to smooth operation of the window lifting mechanism and reduced load on the guides.

Compatibility and Fit for Mercedes W168

The seal has been specifically designed for the door construction of W168 models, ensuring factory geometric fit to the window frame and body pressings. This eliminates the need for modifications during installation, and the contact line with the window and door panel maintains the parameters intended by the vehicle manufacturer.

The part is compatible with the original OEM part number and has assigned replacement numbers, which simplifies verification of compatibility with specific equipment versions. For certainty in selection, it is advisable to compare the vehicle placement and body type with the currently installed part.

Performance Characteristics and Installation Benefits

The rear left door window seal for the Mercedes W168, as a used part, allows for an economical yet technically sound repair of the door area. Using the original design ensures:

• maintenance of correct vertical window guidance geometry,
• reduction of vibrations and play in the lifting mechanism,
• improved sealing at the window-door interface,
• reduced wind noise inside the cabin.

By retaining the factory profile and material hardness, the seal works seamlessly with existing door upholstery and hardware, without requiring intervention in other trim elements.

Professional Installation and Service Application

This part is intended for installation in workshops specializing in Mercedes vehicle service, as well as by advanced users performing repairs themselves. Replacing the seal is particularly recommended in cases of:

• leaks and water ingress around the rear left window,
• excessive noise in the door area at higher speeds,
• difficulties with smooth window raising or lowering,
• mechanical damage to the old seal (cracks, deformations).

Selecting the part with the correct vehicle placement (rear, left side) minimizes the risk of incorrect installation and speeds up service work, which is important for both professional workshops and hobbyist applications.

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 door panels, trim panels, or window trims, check the available parts in the Mercedes Door Upholstery category.

For users interested in a broader powertrain upgrade or tailoring driving characteristics to their preferences, the guide article Used Drive Axles and Differentials – How to Choose Gear Ratios for Your Driving Style may be helpful, discussing practical aspects of selecting used and reconditioned components.