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

Mercedes Vito Viano W639 Rear Quarter Side Window Left N/S Tinted Glass AS3 is an original body component designed specifically for models in this series. As part of the Car Windows group, it ensures a consistent fit to the bodywork, proper geometry, and an aesthetic appearance of the vehicle's side section. The AS3 tinted glass improves travel comfort by reducing interior heating and increasing passenger privacy.

Specifications and technical data

• SKU: A6396721013-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6396721013
• Substitutable numbers: A6396721013, A 639 672 10 13
• Location on the vehicle: Rear, Left
• Part type: Rear Quarter Window
• Category: Car Glass

Purpose and fitment for Mercedes Vito / Viano W639

The offered window is intended for installation in the rear body section on the left side of Mercedes Vito and Mercedes Viano W639 generation models. The glass construction complies with the manufacturer's factory standards, which translates into:

• proper adhesion to the body frame,
• preservation of the vehicle's original side line,
• compatibility with factory seals and mounts.

As a result, replacing a damaged window with this component allows for the restoration of the vehicle's original functionality and appearance without the need for body modifications.

Characteristics of AS3 tinted glass

The Mercedes Vito Viano W639 Rear Quarter Side Window Left N/S Tinted Glass AS3 is made of glass marked as AS3, used in the automotive industry where stronger tinting is required. This type of glass:

• reduces the amount of sunlight reaching the interior,
• limits cabin heating on sunny days,
• increases travel comfort for passengers in the rear of the vehicle,
• improves privacy by making it difficult to see into the interior from the outside.

At the same time, transparency from the inside is maintained, which promotes safe vehicle operation and does not impair visibility for passengers.

Benefits of using an original used window

Choosing an original, used window for the Mercedes Vito / Viano W639 is a solution that combines controlled costs with the preservation of the component's factory parameters. This type of part:

• maintains compliance with safety standards provided for the given model,
• ensures proper rigidity and fit to the body structure,
• eliminates the risk of assembly problems typical of replacements with poorer geometry.

The used condition means that the window comes from dismantling but retains the functionality necessary for further vehicle operation. This is a practical solution for post-accident repairs or replacing a mechanically damaged element.

Safety, OEM quality, and technical aspects

Original windows used in the Mercedes Vito and Viano are designed taking into account the specific loads acting on the side parts of the body. The proper glass thickness, type of lamination or tempering, and fit to the window frame affect:

• the stability of the side structure during operation,
• proper cooperation with seals and interior trim elements,
• adequate stress dissipation during driving and temperature changes.

For users who want to better understand the importance of original body elements and other OEM components, the article Quality assurance and OEM safety – why are used original car parts the best choice for your car?, which discusses the issues of safety and cost-effectiveness of such solutions in more detail, will be helpful.

Integration with other windows and body elements

When replacing the rear side window on the left side, it is worth paying attention to visual consistency with the other windows in the vehicle. The AS3 tinted glass blends well with other factory-tinted windows, creating a uniform side line and an aesthetic appearance of the entire body. Proper matching of the shade and type of glass also affects:

• uniform light transmission characteristics in the cabin,
• harmonious appearance of the vehicle after repair,
• maintenance of the vehicle's utility value after body and paint 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 windshields, sliding side windows, or rear windows, check the available parts in the Mercedes Car Windows category.