Mercedes Vito Viano W639 Rear Left N/S Quarter Side Window Glass AS3 Tinted

Mercedes Vito Viano W639 Rear Left N/S Quarter Side Window Glass AS3 Tinted is a factory body component designed for installation in the rear left section of the vehicle. The AS3-rated tinted glass improves travel comfort by reducing interior heat and increasing passenger privacy. This solution is particularly valued in commercial and family vehicles, where functionality, aesthetics, and consistency with the original body line are essential.

Specifications and technical data

• SKU: A6396721613
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6396721613
• Substitutable numbers: A6396721613, A 639 672 16 13
• Location on the vehicle: Rear, Left
• Category: Car Glass

Purpose and body fitment

The offered window is dedicated to Mercedes Vito and Mercedes Viano W639 generation models, designed for the rear left side of the body. The glass construction is adapted to factory mounting points, which facilitates installation and ensures proper adhesion to the body frame. This maintains the seal, correct body geometry, and compliance with the vehicle's original side line.

Characteristics of AS3 tinted glass

Glass marked with the AS3 rating is a solution used in body zones where reducing light and solar radiation penetration is a priority. The tinting:

• reduces vehicle interior heating on sunny days,
• increases passenger comfort, especially in the rear rows,
• improves protection of transported cargo from prying eyes,
• helps maintain a consistent, factory look for the side of the body.

At the same time, adequate transparency and visibility of the surroundings from the inside are maintained, which is important for vehicle safety.

Performance parameters and role in vehicle construction

As an item in the Car Windows category, this quarter glass performs several key functions in the Mercedes Vito and Viano:

• seals the side of the body in the rear zone of the vehicle,
• stabilizes the side structure in the passenger or cargo area,
• influences interior acoustics by reducing outside noise,
• maintains compliance with the factory design and glazing line.

The placement in the rear left part of the vehicle is important when selecting the component – choosing the correct mounting side minimizes the risk of fitment issues and speeds up service work.

Used condition and economic benefits

The presented window is a used component, which allows for a significant reduction in repair costs compared to purchasing a new part. For many users and workshops, this is a reasonable compromise between quality and budget, especially for post-accident repairs or the renovation of older Vito and Viano models. A properly selected used quarter glass allows for the restoration of full functionality and aesthetics of the side body without excessive service costs.

If you want to better understand how to optimize vehicle service expenses using second-hand parts, it is worth reading the article: Rising repair costs and the boom in used parts – how to save on car service?.

Safe selection and installation of the window

When selecting a quarter glass for a Mercedes Vito or Viano, it is crucial to pay attention to:

• model compatibility (W639 generation),
• correct mounting side (rear – left),
• type of glass (tinted AS3).

An element selected in this way allows for efficient installation in workshop conditions, while maintaining tightness and proper fit with the body. For users who want to deepen their knowledge about safely purchasing parts from the secondary market, the following guide will be helpful: Safe online purchase of used car parts – a step-by-step guide.

Expanding the scope of service work

If you are planning a comprehensive repair or modernization of the side glazing zone in your Mercedes and need other elements from the same group, such as additional side windows, sliding windows, or other glazing formats, check the available parts in the Mercedes Car Windows category.

Summary

Mercedes Vito Viano W639 Rear Left N/S Quarter Side Window Glass AS3 Tinted is a practical solution for users and workshops that want to restore full functionality and aesthetics to the side of the body while keeping costs reasonable. The AS3 tinted glass improves thermal comfort and privacy, and the dedicated placement in the rear left part of the vehicle ensures proper fitment to the construction of the Mercedes Vito and Viano W639 generation.