Mercedes W447 Windscreen Washer Bottle Fluid Tank Reservoir A4478690120

Description

Mercedes W447 Washer Fluid Reservoir A4478690120 is an original component of the washer system from the Washer Tanks, Pumps, and Nozzles category, designed for Mercedes vehicles. It ensures stable fluid storage and proper supply to the washer system, which translates to safe visibility in various road conditions.

Specifications and technical data

• SKU: A4478690120
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A4478690120
• Substitutable numbers: A4478690120, A 447 869 01 20
• Category: Washer Pumps, Reservoirs & Nozzles

Purpose and Fitment for Mercedes W447

The presented washer fluid reservoir has been specifically designed for the Mercedes W447 platform, ensuring it retains factory mounting points and compatibility with the original washer system. The manufacturer’s design allows for installation in place of the original component without the need for body or system modifications.

The appropriate shaping of the reservoir body facilitates the routing of fluid lines and integration with the pump and nozzles, reducing the risk of leaks and operational issues. This solution is particularly beneficial for professional repairs where repeatability and compliance with service documentation are crucial.

Construction and Function in the Washer System

The washer fluid reservoir plays a key role in the entire windshield cleaning system, responsible for storing an adequate amount of fluid and ensuring a stable supply to the pump. The appropriately selected shape and capacity ensure:

• maintaining the correct fluid level at various vehicle tilt angles,
• efficient delivery of the medium to the washer pump,
• minimizing the risk of air entering the system when the fluid level is low.

By using a component that matches the factory specifications, the washer system maintains stable operating parameters, leading to predictable nozzle performance and even fluid distribution across the windshield.

Component Condition and Installation Aspects

The offered washer fluid reservoir is a used part, allowing for economical repair of the system while maintaining the original design. This type of component is particularly useful in situations where mechanical damage has occurred (e.g., after a collision or intervention in the engine bay) and only the reservoir needs replacement without affecting other system components.

During installation, it is recommended to:

• check the condition of fluid lines and connectors,
• verify for leaks after filling the reservoir,
• confirm correct seating at the body mounting points.

This approach minimizes the risk of subsequent leaks and ensures long-term, stable operation of the washer system.

Benefits of Using an Original Washer Fluid Reservoir

Using a washer fluid reservoir dedicated to the Mercedes W447 allows for maintaining the consistency of the entire system with the manufacturer’s design. The most important benefits include:

• factory fitment to the body – no issues with interference with other components in the engine bay,
• stable washer system operation – proper supply to the pump and nozzles,
• easier service diagnostics – the mechanic works with a solution that complies with technical documentation,
• possibility of using existing mounts and accessories without additional modifications.

For the user, this means predictable washer operation, which directly impacts driving comfort and safety in rain, snow, or when driving on dirty roads.

Related Products and Technical Knowledge

If you are looking for other components from the Washer Tanks, Pumps, and Nozzles category dedicated to this brand, check out the Mercedes washer tanks, pumps, and nozzles available in our store to complete the entire system using components that match the factory specifications.

For a better understanding of the relationships between individual vehicle components and how to select parts by identification numbers, it is worth reading the guide article “Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair”, which discusses practical aspects of diagnosing and replacing components in modern cars.