Mercedes W166 Rear Quarter Side Window Glass Left N/S AS3 Tinted A1666702312

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W166 Rear Quarter Side Window Glass Left N/S AS3 Tinted is an original, tinted glass with AS3 marking, designed for installation on the driver's side. As an item in the Car Windows category, it ensures a consistent fit to the bodywork, proper geometry, and an aesthetic appearance of the rear part of the vehicle. This used component allows for an economical, yet technically correct replacement of a damaged window in your Mercedes.

Specifications and technical data

• SKU: A1666702312-2
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1666702312
• Substitutable numbers: A1666702312, A 166 670 23 12
• Location on the vehicle: Rear, Left
• Category: Car Glass

Purpose and body fitment

The described window is a rear side body component, mounted on the left side of the vehicle. The design is specifically prepared for the W166 series body line, ensuring proper sealing, stable seating in the frame, and compatibility with factory seals and trim strips. Dedicated vehicle placement minimizes the risk of installation issues and eliminates the need for modifications.

Technical characteristics of the AS3 tinted glass

The glass features the AS3 marking, which indicates a higher level of tint compared to standard windows. This type of glass is often used in the rear part of the body to reduce interior heating, improve passenger comfort, and increase privacy. The tinted surface also helps reduce glare and improves visual consistency with the other windows in the vehicle.

As an original component designed for Mercedes, the glass maintains factory parameters of thickness, curvature, and glass structure, which is important for both safety and proper adhesion to the bodywork. As a result, there are no unwanted wind noises or issues with water drainage from the body surface after replacement.

Benefits of using an original used window

Choosing a used side window for a Mercedes is a reasonable compromise between cost and quality. You receive a component from dismantling that retains factory parameters and fitment, while significantly reducing repair costs compared to a new part. Original origin means full compatibility with the W166 body structure and no issues with fitting to factory mounting points.

The used condition makes it a good solution for post-accident repairs, replacement after cracking or scratching, as well as vehicle restoration where maintaining the original character of the car is key. This type of element allows you to restore the aesthetics and functionality of the rear body section without straining your budget.

Professional installation and practical application

The rear side window on the left side of the Mercedes W166 requires installation according to the manufacturer's technology – using appropriate seals, clips, and adhesives, if provided in the given body configuration. It is recommended to have the installation performed by a specialized service center to maintain sealing, proper fitment, and passive body safety. A correctly installed window works in harmony with the pillar and roof structure, causing no stress or rattling while driving.

If you are planning a comprehensive repair or upgrade of the side glazing area in your Mercedes and need other elements from the same group, such as rear side windows for the right side, door windows, or additional glazing elements, check the available parts in the Mercedes Car Windows category.

How to safely choose used car windows

When purchasing a used window, it is worth paying attention to compatibility with the vehicle model, the type of tint, and the placement on the vehicle. This will help you avoid installation problems and maintain full body functionality. To better understand how to optimally use the offer of dismantled parts and how to assess their suitability, check out our guide: Used parts – Your guide to the best offers in the automotive store. This is practical support when planning repairs using used components.