Audi A4 B8 Window Seal Door Weatherstrip Gasket Rubber Rear Left N/S 8K5839439F

Audi A4 B8 Window Seal Door Weatherstrip Gasket Rubber Rear Left N/S is a precisely fitted component from the Window seals and moldings category, designed for installation in the rear left door. It is responsible for sealing the contact point between the window and the door frame, reducing noise, water ingress, and contaminants into the vehicle interior, which translates into stable acoustic and operational comfort.

Specifications and technical data

• SKU: 8K5839439F
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K5839439F
• Substitutable numbers: 8K5839439F, 8K5 839 439 F
• Location on the vehicle: Rear, Left
• Category: Window Seals, Gaskets & Trims

Purpose and function of the seal

The rear left door window seal in the Audi A4 B8 works in direct contact with the side window, creating a flexible barrier between the glass and the door structure. Proper profiling ensures:

• maintaining a seal when the window is closed,
• stable window guidance during raising and lowering,
• reduction of wind noise at higher speeds,
• protection of the door interior against excessive moisture.

Thanks to its proper fit to the specific body model, this component works in harmony with the factory window lifting mechanism and other door seals, maintaining the integrity of the entire system.

Compatibility and fit for Audi

The presented seal has been designed specifically for the Audi A4 B8 body version, intended for installation in the rear left door. This means maintaining factory body lines, proper adhesion to the door frame, and correct interaction with the window and upholstery. The lack of need for modifications or forced fitting reduces the risk of leaks and premature wear of the component.

Its original origin from the Audi OE group translates into compliance with factory dimensional and material standards, which is particularly important for components responsible for sealing and driving comfort.

Operational characteristics of the component

As a part from the Window seals and moldings category, this component operates in variable weather conditions, exposed to UV radiation, temperature fluctuations, and contact with water and road contaminants. The seal's construction is intended for long-term operation in such conditions, and its profile ensures:

• stable adhesion to the window edge and door frame,
• reduction of window vibrations while driving,
• maintenance of an aesthetic window edge finish line.

Used condition means that the component comes from dismantling, which in practice allows for maintaining the original fit while reducing repair costs compared to a new part.

Benefits of using an original seal

Using an original window seal in an Audi A4 B8 brings a number of practical benefits:

• maintaining the factory geometry of the window-to-door contact,
• reducing the risk of rattles and squeaks in the window area,
• better protection of the interior against moisture and corrosion of metal components in the doors,
• maintaining a consistent look of the side body line.

For users who pay attention to acoustic comfort and body durability, replacing a worn seal with an original component is a simple way to improve daily vehicle operation.

Installation area and related components

The seal is mounted in the rear left part of the body, within the door and side window area. In practice, it works with window guides, the lifting mechanism, and other door seals. Proper installation requires keeping the contact surface clean and ensuring even seating along the entire length, which helps avoid local leaks.

If you are planning a comprehensive repair or modernization of the side window sealing area in your Audi and need other components from the same group, such as additional door frame seals, trim strips, or guide seals, check out the available parts in the Audi window seals and moldings category.

Additional information and inspiration

While working on doors and windows, many users also decide to refresh the vehicle interior, improve ergonomics, and change the character of the cabin. If you are considering such actions, it is worth checking out the guide on interior personalization: Car interior tuning with Global Parts. There you will find practical tips on how to effectively combine used equipment components with the existing vehicle configuration.