Mercedes W166 Window Glass Door Rear Left N/S Side Quarter AS3 A1666702112

Mercedes W166 Window Glass Door Rear Left N/S Side Quarter is an original body component designed for installation in the rear door on the driver's side. Thanks to its factory-standard manufacturing, it ensures proper fitment to the bodywork, airtight sealing, and correct operation with the window lifting mechanism, which translates into acoustic comfort and passenger safety. This is a particularly beneficial solution for post-accident repairs, replacing a damaged window, or restoring the full functionality of the vehicle's side zone.

Specifications and technical data

• SKU: A1666702112
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1666702112
• Substitutable numbers: A1666702112, A 166 670 21 12
• Location on the vehicle: Rear, Left
• Category: Car Glass

Purpose and fitment

The presented window belongs to the Car Windows category and was designed specifically for the Mercedes W166 series SUV body. Its placement in the vehicle is the rear left side, which means installation in the rear door on the driver's side for left-hand drive versions. The window's construction complies with the manufacturer's factory standards, which facilitates installation in place of the original part without the need for bodywork modifications or changes to the guides.

Technical and functional characteristics

The AS3 side window is designed to work with the standard lifting and lowering mechanism in the rear door. The glass technology used ensures appropriate resistance to operational loads, as well as resistance to typical stresses occurring in the door zone. The component has been prepared for use with factory seals and guide rails, which allows for maintaining proper sealing and reducing noise in the cabin.

Thanks to the preservation of the original edge geometry and the correct bending radius, the window works properly with the door frame and bodywork, which is important both for aesthetics and for the correct closing of the door. This is particularly important in the case of premium class vehicles, where precision in body component fitment influences the overall perception of quality.

Use in repairs and restorations

This component is suitable both for standard post-accident repairs and for the comprehensive restoration of vehicles from the years in which the W166 series was produced. Replacing the side window is recommended in the case of cracks, scratches that hinder visibility, edge damage, or problems with proper movement in the guides. Using an original window allows for maintaining the car's factory character, which is significant in maintaining the vehicle's market value.

If you are interested in a broader context of using used components when refreshing cars from the turn of the years, it is worth reading an article describing how properly selected components can rejuvenate premium class cars – details can be found in the material "The second life of a youngtimer – how used car parts rejuvenate cars from the 1998–2012 model years".

Benefits of choosing an original used window

Choosing an original, used side window for a Mercedes W166 is a solution that combines cost control with the preservation of factory manufacturing quality. This type of component allows you to:

• maintain a consistent look of the side body line,
• maintain compatibility with existing seals and guides,
• minimize the risk of problems with door closing and window mechanism operation,
• reduce repair costs compared to purchasing a new window.

For owners of Mercedes vehicles, it is important that the use of original body components helps maintain the characteristic level of acoustic comfort and aesthetics consistent with the manufacturer's design. This is particularly important in higher-class cars, where visual and technical consistency has a direct impact on the perception of the entire vehicle.

Expanding repairs within Mercedes side windows

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