Mercedes-Benz A M-Class ML W164 W169 Door Window Regulator Seal Cover Cap Plug

Mercedes-Benz A M-Class ML W164 W169 Door Window Regulator Seal Cover Cap Plug is a precision body component designed for sealing and aesthetically finishing the door window in selected Mercedes models. A properly selected seal from this group ensures stable window seating, limits moisture ingress, and improves cabin acoustic comfort. Thanks to the preservation of factory geometry, it constitutes a functional service solution for door and side window repairs.

Specifications and technical data

• SKU: A2517220280
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2517220280
• Substitutable numbers: A2517220280, A 251 722 02 80
• Category: Door Seals

Purpose and technical function

The door window seal cover cap in Mercedes W164 and W169 class models is responsible for a tight connection between the window and the door structure. This component:

• limits the ingress of water and contaminants into the door interior,
• supports the proper operation of the window regulator mechanism,
• stabilizes the window edge in the guides,
• improves acoustic insulation in the door area.

By maintaining the original geometry, the seal helps maintain proper window fitment, which is essential for both driving comfort and the durability of the lifting mechanisms.

Benefits of using an original door seal

Using a component from the Door seals group dedicated to specific Mercedes bodies allows for maintaining factory fitment and predictable performance during operation. In practice, this means:

• better fit to the door and window profile than universal replacements,
• stable retention of the window in the guides during repeated opening and closing,
• reduced risk of rattles, play, and unwanted noises from the door area,
• aesthetic finish of the window edge from the body side.

For users who want to restore the original properties of the doors after bodywork or window replacement, such a seal is a practical and technically sound choice.

Component condition and service application

The offered door window seal cover cap is an aftermarket part, which allows for economical repair while maintaining the original design. This type of component is particularly useful in situations where:

• the existing seal is perished, deformed, or mechanically damaged,
• after bodywork, it is necessary to re-align the window with the door,
• there are leaks, wind noise, or increased moisture in the doors.

The selection of the correct element from this group should always be based on compatibility with the specific body model and part number, which facilitates subsequent installation and reduces the time required for fitting.

Integration with other Mercedes door components

The door window seal cover cap works in conjunction with the window regulator mechanism, guides, and door panel. A correctly selected component:

• ensures even pressure of the window along the entire length of the edge,
• helps maintain the proper geometry of the gap between the window and the door frame,
• limits the loads acting on the window regulator mechanism.

This is particularly important in vehicles used daily, where multiple cycles of opening and closing doors and operating windows can accelerate component wear if the seal is not properly selected.

Expanding the scope of repairs within Mercedes doors

If you are planning a comprehensive repair or upgrade of the door area in your Mercedes and need other components from the same group, such as additional edge seals, window frame seals, or lower door seals, check the available parts in the Mercedes door seals category.

More about using aftermarket parts

If you are interested in the broader context of using pre-owned components in cars and want to better understand how to combine savings with maintaining high quality, it is worth reading an article describing a practical approach to repairs and modifications using second-hand parts: Audi on second-hand parts – tuning and repairs without loss of quality.