Mercedes W166 Window Glass Rear Left N/S Quarter Side Black AS3 A1666702712

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W166 Window Glass Rear Left N/S Quarter Side Black AS3 is an original body component from the Car Windows category, designed for installation in the rear section on the driver's side. The dark, black finish of the frame and the AS3 marking ensure proper tinting and optical comfort while maintaining the vehicle's factory character.

Specifications and technical data

• SKU: A1666702712
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1666702712
• Substitutable numbers: A1666702712, A 166 670 27 12
• Location on the vehicle: Rear, Left
• Color: Black
• Category: Car Glass

Purpose and fitment

The presented Mercedes W166 Window Glass Rear Left N/S Quarter Side Black AS3 has been designed specifically for the W166 series body, ensuring a proper fit to the body lines and correct seating in the frame. Its placement in the rear zone on the left side of the body allows for the restoration of full functionality and sealing of this part of the vehicle after damage or replacement of the factory component.

The black color of the window frame harmonizes with factory moldings and seals, which facilitates aesthetic integration with other body elements. As a result, a consistent, factory-original look of the car is maintained after installation, without the need for additional modifications.

Technical and functional characteristics

The glass belongs to the group marked as AS3, which indicates an increased level of tinting compared to standard front windows. This configuration helps reduce interior heating, improves passenger comfort in the back seat, and increases the sense of privacy while driving and parked.

The element has been manufactured using technology appropriate for Car Windows used in modern bodies, maintaining the correct thickness and glass structure. The design is adapted to work with factory seals, guides, and mounts, which facilitates installation in the vehicle and minimizes the risk of leaks.

Product condition and benefits of choosing a used part

The offered Mercedes W166 Window Glass Rear Left N/S Quarter Side Black AS3 is a used item, which allows for an economical vehicle repair while maintaining the original origin of the component. Choosing such a solution is particularly beneficial in the case of post-accident repairs or replacement of individual windows, where both cost and compliance with factory specifications are important.

If you want to better understand how to responsibly approach the purchase of second-hand parts and dispel doubts regarding their quality, it is worth reading the article "Used car parts: Myths and facts you need to know". Practical information can be found in the material: Used car parts: Myths and facts you need to know.

Safety, comfort, and practical application

A properly selected rear side window is important not only for aesthetic but also for functional reasons. It affects:

• maintaining the proper lateral stiffness of the body in the rear part of the vehicle,
• protection of the interior against weather conditions,
• acoustic comfort thanks to proper damping of outside noise,
• stable mounting in factory mounting points.

Thanks to the use of an original window intended for the specific W166 body model, compatibility with existing interior trim elements and external decorative moldings is maintained. This solution is particularly beneficial for repairs where visual and technical consistency of the entire side of the vehicle is important.

Repair expansion and related elements

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, door windows, or rear windows, check the available parts in the Mercedes Car Windows category.

This approach allows you to refresh the entire left side of the body or the entire rear part of the vehicle in one stage of work, which is particularly important after major body and paint repairs. By choosing original windows matched to the W166 series, you maintain the technical and visual consistency of the entire glazing set.