Volkswagen Passat B7 Window Seal Door Rear Left N/S Sealing Gasket 3C9839431H

The Volkswagen Passat B7 Rear Left Window Regulator Seal is an original body part from the Window Seals and Trim group, designed for installation in the rear left section of the vehicle. It ensures stable window guidance and a tight seal along the edges, which reduces noise, vibrations, and moisture ingress into the cabin. This is a practical solution for users who want to restore the proper function of the window mechanism in their Passat B7.

Specifications and technical data

• SKU: 3C9839431H
• Mark: Volkswagen
• Condition: Used
• OEM Part Number: 3C9839431H
• Substitutable numbers: 3C9839431H, 3C9 839 431 H
• Location on the vehicle: Rear, Left
• Category: Window Seals, Gaskets & Trims

Intended Use and Function of the Part

The described regulator with seal operates in the area of the rear left side window, responsible for proper window guidance within the regulator channel and its pressing against the door frame. Thanks to this:

• it limits air drafts at higher speeds,
• it helps reduce wind noise and window vibrations,
• it supports protection of the interior from water and dirt,
• it stabilizes the window during raising and lowering.

A component configured in this way is particularly important in vehicles used daily, where acoustic comfort and bodywork sealing directly impact driving comfort.

Construction and Fit for Passat B7

The regulator integrated with the seal has been specifically designed for the geometry of the rear left body section of the Volkswagen Passat B7. This means that:

• the seal profile is matched to the shape of the door frame and window,
• the mounting points correspond to factory mounting holes,
• the rigidity of the regulator ensures proper window guidance throughout its entire operating range.

This solution facilitates installation and allows for maintaining factory fitment of components, without the need for modifications or adjustments of aftermarket parts with uncertain geometry.

Benefits of Using an Original Regulator with Seal

Using a dedicated regulator with seal in the Passat B7 translates into specific technical benefits:

• Stable Window Operation – reduced lateral play and smooth guidance throughout the entire range of motion.
• Improved Bodywork Sealing – reduced risk of leaks around the rear window.
• Enhanced Acoustic Comfort – reduced cabin noise, especially during highway driving.
• Consistency with Factory Construction – the part comes from the same group as original components installed on the production line.

For users who want to restore the original bodywork properties after a collision, corrosion, or wear and tear, this configuration is a technically safe and predictable solution.

Installation Characteristics and Application

The regulator with seal is intended for installation in the rear left part of the vehicle, which should be considered when planning repairs or replacements. In practice, this part is most often used in situations where:

• the window operates with noticeable resistance or jerks,
• leaks and noise appear in the vicinity of the rear window,
• the regulator or seal has suffered mechanical damage.

Selecting the correct component from this group helps avoid problems with window closing, excessive strain on the lifting mechanism, and accelerated wear of other window components.

Expanding Repair Scope and Related Parts

If you are planning a comprehensive repair or upgrade of the window area in your Volkswagen and need other parts from the same group, such as additional regulators, edge seals, or trim strips, check the available parts in the Volkswagen Window Seals and Trim category.

For users interested in a broader approach to vehicle servicing, including attention to engine accessories and selection of appropriate replacement parts, the following guide article may be helpful: Reliability under the star – how to care for engine accessories in popular Mercedes-Benz C-Class and E-Class models?.