Audi A4 B8 Avant Door Window Seal Rear Left N/S Guide Frame Gasket 8K9839439

Audi A4 B8 Avant Door Window Seal Rear Left N/S Guide Frame Gasket is an original body component from the Window seals and trims group, designed for installation in the rear left door of the estate (Avant) model. It ensures a tight fit for the window, reduces wind noise, and helps maintain proper interior insulation against water and contaminants.

Specifications and technical data

• SKU: 8K9839439
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K9839439
• Substitutable numbers: 8K9839439, 8K9 839 439
• Location on the vehicle: Rear, Left
• Category: Window Seals, Gaskets & Trims

Purpose and function of the seal

The presented seal is dedicated to the rear left door area of the Audi A4 B8 generation in the Avant version. It is responsible for the stable guidance of the window within the door frame and for maintaining proper pressure along the entire perimeter, which translates into reduced vibrations and the correct operation of the window lifting mechanism.

A properly selected window seal contributes to:

• noise reduction in the cabin at higher speeds,
• protection of the door interior against excessive moisture ingress,
• reducing the risk of window fogging from the inside,
• stable window guidance in the tracks.

Benefits of using an original Audi seal

The original door window seal is designed for the specific body geometry of the Audi A4 B8 Avant, ensuring precise fitment to the door frame and proper adhesion to the glass. In practice, this means no modifications are required, even pressure along the entire length, and predictable performance during operation.

The main advantages of using a factory solution include:

• maintaining the factory level of acoustic comfort,
• consistency with other body sealing elements,
• reducing the risk of leaks at critical corner points,
• easier diagnostics of any potential future faults within the door area.

Installation characteristics

The seal is designed for installation in the rear left part of the vehicle, within the frame of the Avant door. The component's design is matched to factory mounting points, which facilitates service work and allows for maintaining the correct geometry of the window guidance.

When replacing, it is worth paying attention to:

• thorough cleaning of the contact surface in the door frame,
• checking the condition of the window guides and the lifting mechanism,
• correct positioning of the seal in the corners, without twists or kinks.

Condition of the component and practical application

The offered seal comes from the secondary market, which allows for an economical replacement of the component while maintaining the original design specifications. This solution is particularly beneficial for post-accident repairs, removing the effects of corrosion within the door, or when replacing the glass if the existing seal is worn or deformed.

Using a properly selected seal in the rear left part of the body helps restore the vehicle's proper operating conditions, including acoustic comfort and protection of the interior against external factors.

Complementary Audi window seals and trims

If you are planning a comprehensive repair or upgrade of the door area in your Audi and need other elements from the same group, such as additional window seals, trim strips, or glass guidance elements, check the available parts in the Audi window seals and trims category.

For users interested in a broader context of operating diesel-engined cars and the costs of secondary market parts, an article comparing popular BMW units may be helpful – you can find it here: BMW N47 vs M57 / M57N / M57N2 – a ranking of legendary diesels.