Side Quarter Window Mercedes Vito W639 Front Left N/S Triangle Glass Glazing AS2

Visual condition of the part

The product shows signs of use visible in the photos.

Side Quarter Window Mercedes Vito W639 Front Left N/S Triangle Glass Glazing AS2 is an original component from the Car windows group, designed for installation in the front left part of the vehicle body. Thanks to its factory-fit design for the Mercedes structure, it ensures a stable fit, correct glazing geometry, and predictable body behavior while driving.

Specifications and technical data

• SKU: A6396736705
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6396736705
• Substitutable numbers: A6396736705, A 639 673 67 05, A6396734905, A 639 673 49 05
• Location on the vehicle: Front, Left
• Category: Car Glass

Purpose and function of the triangle window

The triangle window in the front left part of the body is responsible for illuminating the cabin, improving side visibility, and stiffening the door frame and pillar. In the Mercedes Vito W639 model, this component works in conjunction with the main side window, seals, and door frame to create a tight and stable glazing system.

Proper fitment of the glass shape and thickness is crucial for the performance of the seals, reduction of wind noise, and maintaining the correct structural rigidity in the front door area. Using glass with the correct optical class contributes to driver and passenger comfort, especially during long journeys.

AS2 standard and build quality

The AS2 marking refers to the class of glass used in the automotive industry, ensuring adequate light transmission and resistance to mechanical damage in side applications. This type of glass is designed for safe fragmentation in the event of damage and to maintain clarity under typical operating conditions.

The original triangle window for the Mercedes Vito W639 is a product matched to the factory dimensions of the door frame, which facilitates installation and reduces the risk of stress in the glass. As a result, after correct installation, it is possible to achieve uniform seal pressure and stable operation of the entire glazing set on the driver's side.

Vehicle placement and installation aspects

The component is intended for installation in the front – left side of the vehicle area, within the door or the adjacent pillar. Proper placement is important for:

• maintaining the correct body line and fitment with the door frame,
• ensuring a tight connection with seals and trim strips,
• reducing air turbulence and noise in the cabin,
• stable operation of the door opening mechanisms.

During installation, it is recommended to use appropriate sealing and fastening materials in accordance with the vehicle manufacturer's technology. A correctly seated triangle window supports the durability of the entire door system and the maintenance of factory acoustic parameters.

Characteristics of the used part

The presented window belongs to the group of used parts, which means it comes from vehicle dismantling and has been previously operated. Such components are often chosen for post-accident repairs and when replacing damaged glazing, where the priority is to maintain the original manufacturer's specification at reasonable service costs.

In the case of used windows, it is important to pay attention to the condition of the working surface, edges, and mounting points. A properly selected element allows for restoring full functionality of the glazing without the need for interference with the door or pillar structure.

Benefits of choosing an original used window

Choosing an original triangle window for the Mercedes Vito W639 from the secondary market combines technical and environmental aspects. On one hand, the factory geometry and glass characteristics are preserved, and on the other – the consumption of raw materials and energy needed to produce a new component is reduced. You can find more about the impact of such decisions on the environment in the article Sustainable automotive: How purchasing original used parts reduces the carbon footprint and protects the environment?.

This approach allows for maintaining the vehicle's technical efficiency while aligning with the trend of responsible operation of commercial and fleet vehicles.

Mercedes car windows – expansion and modernization

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