Mercedes Vito W639 Air Conditioning Duct Channel Tube Rear Left N/S A6398300423

Mercedes Vito W639 Air Conditioning Duct Channel Tube Rear Left N/S is an original air ventilation component designed for installation in the rear left section of the vehicle interior. It ensures organized airflow to the rear cabin zone, which translates into stable thermal comfort for passengers. As part of the Trims, moldings, and decorative elements group, it also contributes to the aesthetic finish of the interior side panel.

Specifications and technical data

• SKU: A6398300423
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6398300423
• Substitutable numbers: A6398300423, A 639 830 04 23
• Location on the vehicle: Rear, Left
• Category: Trim

Purpose and function of the air duct

The presented air duct channel is designed specifically for Mercedes Vito and Viano W639 generation models, intended for installation in the rear left part of the vehicle. It is responsible for directing airflow from the factory ventilation and air conditioning system to the rear passenger area, minimizing flow losses and unwanted turbulence.

This component serves both a technical and finishing role – it covers the ventilation ducts, organizes the installation space, and helps maintain a consistent look for the side of the cabin. Thanks to its dedicated shape tailored to the W639 body, the duct works seamlessly with factory mounts and adjacent trims.

Construction, fitment, and installation

As part of the Trims, moldings, and decorative elements group, the duct is structurally prepared for integration with other interior panels. The profile of the component matches the geometry of the rear left cabin zone, which facilitates correct alignment with the floor, side panels, and factory ventilation ducts.

This solution allows for:

• maintaining the proper cross-section of the ventilation duct in the rear of the vehicle,
• reducing airflow noise by guiding it through an enclosed duct,
• aesthetically closing the installation space without the need for additional modifications.

The component is designed for installation in place of the factory duct, which helps preserve the original interior construction and facilitates service work on the ventilation system.

Performance characteristics and benefits

A properly selected air duct in the rear left section of a Mercedes Vito or Viano W639 has a direct impact on passenger travel comfort. Properly routed ventilation:

• stabilizes temperature distribution in the cabin,
• improves the efficiency of air conditioning and heating in the rear zone,
• reduces window fogging in the passenger area.

Choosing an original component from this group allows you to maintain structural and visual consistency of the interior, and also facilitates future service maintenance. It is a practical solution when replacing a damaged duct, repairing the ventilation system, or restoring the vehicle to a factory-like condition.

Condition, origin, and value

The offered duct belongs to the Mercedes brand and comes from dismantling, which allows you to combine original fitment with a favorable cost-to-functionality ratio. For many users, this is a sensible alternative to new aftermarket replacements, especially during interior repairs where matching existing trims and moldings is crucial.

If you are considering whether it is better to refurbish a component or purchase a used original, an article describing the differences between these approaches may be helpful – more information can be found in the material Refurbished or used original – which part to choose for repairs?.

Expanding interior upgrades

If you are planning a comprehensive repair or upgrade of the interior finish in your Mercedes and need other components from the same group, such as trims, moldings, or decorative panels, check out the available parts in the category Mercedes trims, moldings, and decorative elements.