BMW F44 Gran Coupe Window Lifter Regulator With Motor Rear Door Left N/S 4876379

BMW F44 Gran Coupe Window Lifter Regulator With Motor Rear Door Left N/S is a precision component from the Window regulators and motors category, designed for the rear left window in the Gran Coupe body style. It is responsible for stable window guidance and proper interaction with the lifting mechanism, which translates into comfort and safety when using your BMW vehicle.

Specifications and technical data

• SKU: 4876379
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 4876379
• Substitutable numbers: 4876379, 51354876379, 9854231, 61359854231
• Location on the vehicle: Rear, Left
• Category: Window Motors & Regulators

Purpose and function in the vehicle

The window lifter regulator in the rear left door is a key component of the system responsible for the smooth opening and closing of the window. In the BMW F44 Gran Coupe model, it is responsible for:

• stable window guidance in the tracks,
• transferring drive from the lifter motor to the window,
• maintaining the correct operating geometry of the mechanism in the rear left door,
• ensuring tightness and the correct position of the window relative to the seals.

Thanks to a properly selected regulator, the window system maintains factory operating parameters, which reduces noise, vibrations, and the risk of mechanical damage.

Benefits of using an original BMW component

Using an original regulator dedicated to the BMW F44 Gran Coupe allows you to maintain the structural integrity of the door and compatibility with factory equipment. The original design ensures appropriate mounting points, the correct operating stroke, and a perfect fit for the stock window tracks.

The main advantages of this solution include:

• a secure fit for the rear left door without the need for modifications,
• maintaining proper cooperation with the factory lifter motor,
• reducing the risk of window jamming and uneven mechanism operation,
• maintaining factory acoustic comfort inside the cabin.

Installation and operational characteristics

The regulator is designed for installation in the rear left part of the body, in the passenger door behind the driver. The design intended for BMW allows for installation in place of the factory component, using stock mounting points and original window system connectors.

In practice, this means:

• the possibility of use as a replacement for a damaged regulator after a collision or due to wear and tear,
• maintaining the correct position of the window relative to the door frame,
• proper cooperation with the factory window controls in the BMW.

The used component allows for an economical repair of the window system while maintaining the vehicle's original specifications.

Why consider a used window regulator

For components such as a window lifter regulator, using a pre-owned part is often a rational service choice. This type of mechanism is not a fast-wearing part under normal operation, which is why a functional used regulator can successfully continue to work in another vehicle.

You can find more about the approach to purchasing used powertrain components and the principles of selection by identification numbers in the article: Why it is worth buying used gearboxes and engines – facts instead of myths. Although it mainly concerns engines and gearboxes, the verification and selection procedures described there using OEM numbers can be analogously applied when choosing other components, including window system elements.

Expansion and service of the BMW window system

If you are planning a comprehensive repair or upgrade of the door and window area in your BMW and need other elements from the same group, such as additional regulators, compatible motors, or related tracks, check out the available parts in the BMW Window regulators and motors category.

When working on the vehicle's interior, it is also worth considering improving the ergonomics and comfort of the cabin. Inspiration regarding the use of used equipment elements can be found in the guide: Car interior tuning with Global Parts, which discusses practical possibilities for modernizing the car's interior using proven components from the secondary market.

Summary

BMW F44 Gran Coupe Window Lifter Regulator With Motor Rear Door Left N/S is a dedicated window system component designed for the rear left part of the body. Properly selected and correctly installed, it restores the factory functionality of the window lifting mechanism, ensuring ease of operation and proper cooperation with other door components in your BMW.