BMW F40 Window Guide Sealing Left Rear Door N/S 7452345

The BMW F40 Rear Left Door Window Regulator Seal is a precise body component responsible for stable window guidance and reducing noise and vibrations during driving. Thanks to its specific fit for the BMW model and placement in the rear left part of the vehicle, it ensures the proper functioning of the window lifting mechanism and maintains adequate sealing in the door area. This is a particularly useful solution for professional repairs or restoring the original functionality of the side body area.

Specifications and technical data

• SKU: 7452345
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7452345
• Substitutable numbers: 7452345, 51357452345
• Location on the vehicle: Rear, Left
• Category: Window Seals, Gaskets & Trims

Purpose and Fit for BMW F40

The presented window regulator seal has been designed with the BMW F40 series body in mind, taking into account the geometry of the rear left door. Its placement in the rear driver's side of the vehicle (in left-hand drive versions) allows for proper vertical window guidance, which translates to even closing and reduced play in the guides.

Thanks to its construction aligned with BMW's factory specifications, this component works with the original window lifting mechanism and door frame, facilitating installation and maintaining consistency with the factory body line.

Function of the Window Regulator Seal

The window regulator seal in the rear left door performs several important operational functions:

• stabilizes the window during raising and lowering, limiting sideways tilting,
• creates a barrier against dirt that could enter the door interior and the lifting mechanism,
• supports maintaining proper sealing at the contact point between the window and the door frame,
• helps reduce wind noise occurring at higher speeds.

A properly selected window regulator seal is particularly important when experiencing issues with uneven window operation, excessive noise around the door, or visible leaks at the window-frame junction.

Characteristics of the Used Part

The offered part comes from the Window Seals and Trim group and is a used component. In practice, this means the possibility of an economical repair while maintaining original geometry and fit to the BMW body. For this type of component, it is crucial that they retain their shape and flexibility, allowing for correct seating in the door frame and cooperation with the window.

Choosing an original, salvaged window regulator seal is a solution often preferred in professional workshops where compatibility with factory body parts and the ability to restore original window operating parameters without modifying mountings are important.

Benefits of Using a Dedicated BMW Seal

Using a dedicated window regulator seal in the rear left door of the BMW F40 allows for:

• restoring proper vertical window guidance,
• reducing creaks and knocks resulting from play in the guides,
• improving acoustic comfort inside the vehicle,
• maintaining visual and structural consistency with other door components.

For users who want to keep their car in a condition close to factory-original, using an original window regulator seal is a technically justified solution that allows for stable, predictable operation of the side window.

If you are planning a comprehensive repair or upgrade of the side glazing area in your BMW and need other parts from the same group, such as additional guide seals, trim strips, or edge seals, check the available parts in the BMW Window Seals and Trim category.

For drivers interested in a broader approach to maintaining their car in good condition, including checking suspension operation and its impact on driving comfort and cabin noise, the advisory material Suspension System – A Comprehensive Guide to Shock Absorbers, Control Arms, and Stabilizers may be helpful, facilitating a better understanding of the relationships between individual vehicle systems.