Mercedes W177 Door Card Mount Rear Left N/S Window Regulator Lifter Holder Panel

Mercedes W177 Door Card Mount Rear Left N/S Window Regulator Lifter Holder Panel is an original component from the Window regulators and motors group, designed for the rear left window in the W177 body style. It is a practical solution for users who want to restore the proper operation of the window lifting mechanism while maintaining the factory design and fit characteristic of the Mercedes brand.

Specifications and technical data

• SKU: A1777300302
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1777300302
• Substitutable numbers: A1777300302, A 177 730 03 02
• Location on the vehicle: Rear, Left
• Category: Window Motors & Regulators

Purpose and function of the window regulator

The presented regulator is designed to operate in the area of the rear left window, mounted within the door card. It is responsible for stable window guidance and smooth lifting and lowering, working in conjunction with the vehicle's electric control system. Thanks to a design consistent with factory solutions, the correct geometry of the guides and proper positioning of the window relative to the seals and door frame are maintained.

The vehicle placement specified as rear – left side allows for unambiguous identification of the component and reduces the risk of error when selecting parts for a specific mounting location.

Benefits of using an original Mercedes component

The window regulator dedicated to the W177 ensures:

• factory fitment to the door and door card structure,
• proper cooperation with the factory window control motor,
• stable window guidance throughout the full range of motion,
• reduction of noise and vibrations during the mechanism's operation.

Using an original solution from the Window regulators and motors group facilitates installation, as the mounting points, shape, and geometry of the guides are consistent with the factory design specifications of the W177 body.

Installation and operational characteristics

The regulator is intended for installation in the rear left part of the vehicle, within the passenger door area, depending on the body configuration. The design, intended for cooperation with the door card, allows for service replacement of the component without interfering with the body structure.

In practice, this means that after removing the door upholstery, it is possible to access the mechanism, replace it, and reset the window in the guides. Maintaining the correct window position minimizes the risk of leaks, jams, and uneven closing.

Selection by OEM number and compatibility

The component should be selected based on the OEM number and information about its placement on the vehicle. This allows for verifying compatibility with a specific equipment version and W177 body year. In case of doubt, comparing data with vehicle documentation or consulting a mechanic may be useful.

If you want to streamline the process of selecting parts by OEM number or VIN, you will find practical tips in the guide: how to choose the right car part by VIN and OEM number. This is a helpful supplement when planning the replacement of components in the window system.

Expansion and modernization of the window system in Mercedes W177

If you are planning a comprehensive repair or modernization of the door and window area in your Mercedes and need other components from the same group, such as additional regulators, control motors, or related window guide mechanisms, check the available parts in the Mercedes Window regulators and motors category.

For drivers interested in broader knowledge about typical operational problems in modern cars, including costly engine failures, the following article may be useful: BMW E90 faulty engines: check what can ruin your budget!. It allows for better planning of service and maintenance budgets for the vehicle, regardless of the brand.