Mercedes W639 Rear Window Tailgate Trunk Wiper Arm A0018207344

The Mercedes W639 Rear Wiper Arm for the Rear Window is an original part from the Wiper Arms group, designed for the vehicle's rear window. It ensures stable wiper blade guidance, which translates to clear visibility in the rearview mirror and safe driving in rain and when the rear window is dirty.

Specifications and technical data

• SKU: A0018207344
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A0018207344
• Substitutable numbers: A0018207344, A 001 820 73 44, A6398201244
• Location on the vehicle: Rear
• Category: Wiper Arms

Purpose and Function in the Wiper System

The rear wiper arm in the Mercedes W639 is responsible for precisely pressing the blade against the glass surface and for transferring motion from the drive mechanism to the blade. A correctly selected arm guarantees even pressure along the entire length of the blade, reduces streaks, and improves the effectiveness of removing water, mud, and road salt.

The component is mounted at the rear of the vehicle, on the axis of operation of the rear wiper. The correct adaptation of the arm's geometry to the window and bodywork is important both for wiping effectiveness and for avoiding collisions with seals or body elements.

Benefits of Using an Original Mercedes Arm

Using an original wiper arm in the Mercedes W639 allows for the preservation of the wiper system's original operating parameters. Key benefits include:

• appropriately selected length and working angle of the arm relative to the rear window,
• stable mounting to the drive axis, reducing play and vibrations,
• correct blade pressure, which reduces the risk of streaks,
• compatibility with the original wiper mechanism and the W639 model's bodywork.

Thanks to this, the wiper system maintains predictable, repeatable operation, and the driver is ensured better rear visibility in various weather conditions.

Characteristics of a Used Part

The offered wiper arm is a used part, sourced from dismantling. Such components are often chosen for vehicle servicing when maintaining the original construction while optimizing repair costs is important. The arm retains the functionality necessary for further operation, with natural signs of use being typical for parts in this group.

Before installation, a standard check of the mounting socket, arm springiness, and the connection to the drive axis is recommended to ensure smooth operation and correct blade pressure against the glass.

Selection and Installation in the Vehicle

When selecting a rear wiper arm for the Mercedes W639, it is crucial to match it to the specific body version and the wiper system used in the vehicle. In practice, this means paying attention to:

• compatibility with the rear window and its curvature,
• the type of mounting to the drive axis,
• the type of wiper blade intended for use with the given arm.

Installing the arm is a service task of moderate difficulty and usually involves correctly setting the rest position on the window and tightening the mount with appropriate force. A correctly positioned arm should not catch on seals or body edges in its extreme operating positions.

Expanding Wiper System Service

Replacing the rear wiper arm is a good opportunity to comprehensively assess the condition of the entire system – including the blade, drive axis, and seals around the rear window. Regular maintenance of these components reduces the risk of mechanism seizure, excessive play, and noise during wiper operation.

If you are planning a comprehensive repair or upgrade of the rear window visibility zone in your Mercedes and need other parts from the same group, such as additional arms, compatible brackets, or dedicated mounts, check the available parts in the Mercedes Wiper Arms category.

To better care for the durability of parts from dismantling, including wiper arms, it is worth learning practical tips on operation and maintenance – you will find them in the article How to Extend the Lifespan of Used Car Parts?.