Coolant Hose Mercedes W205 Diesel M626 OM651 AdBlue Cooling Feed Return Line

Coolant Hose Mercedes W205 Diesel M626 OM651 AdBlue Cooling Feed Return Line is a specialized component of the cooling and AdBlue dosing system in Mercedes diesel engine vehicles. It is responsible for the safe routing of the medium in the water radiator area, which is essential for the stable operation of the exhaust emission reduction system in Diesel units. This solution is designed for users who expect compatibility with the vehicle's factory design.

Specifications and technical data

• SKU: A2055012891-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2055012891
• Substitutable numbers: A2055012891, A 205 501 28 91
• Fuel type: Diesel
• Category: Hoses, Lines & Pipes

Purpose and technical function

The described hose belongs to the Hoses, pipes and lines group and operates within the cooling system and AdBlue system in Mercedes diesel vehicles. Its task is to provide stable fluid routing near the water radiator, ensuring that the nitrogen oxide reduction system can function within the temperature range specified by the manufacturer.

In Diesel engines, such as units from the OM651 family, the proper operation of hoses and lines has a direct impact on:

• maintaining the correct operating parameters of the AdBlue system,
• temperature stability in the water radiator area,
• reducing the risk of leaks and performance drops in the exhaust treatment system.

Benefits of using the hose in the AdBlue system

Using a hose designed to match the water radiator system in a Mercedes Diesel allows for maintaining the factory geometry of hose routing and proper support on the mounts. As a result:

• the risk of incorrect hose positioning in the engine bay is reduced,
• the possibility of rubbing against other components and associated damage is limited,
• diagnostics and potential removal during future service work are facilitated.

For workshops and users, this means more predictable installation and the maintenance of system operating parameters in accordance with the vehicle manufacturer's specifications.

Product characteristics and application in Diesel engines

The hose has been designed to work with a Diesel-powered system, where the presence of an AdBlue system is crucial for meeting exhaust emission standards. In these types of power units, it is particularly important to ensure:

• tightness of connections in the area of hoses and lines,
• resistance to thermal conditions prevailing in the water radiator area,
• maintenance of appropriate hose stiffness and flexibility during operation.

This type of component is chosen primarily when the existing hose has become worn, mechanically damaged, or when signs of leaks have appeared in the AdBlue system near the water radiator.

Product condition and installation aspects

The offered hose belongs to the group of used parts, which allows for economical repair while maintaining compatibility with the factory system design. In workshop practice, such a solution is often chosen for comprehensive work within the cooling system and emission reduction system in Diesel engines.

Before installation, a standard visual inspection of the hose, checking the connection sockets, and assessing the condition of cooperating system components is recommended. A properly selected hose facilitates installation and helps reduce the time required to restore full efficiency to the AdBlue system.

System expansion – other Mercedes hoses and lines

If you are planning a comprehensive repair or upgrade of the cooling and AdBlue system area in your Mercedes and need other components from the same group, such as additional hoses, pipes, or lines for routing the working medium, check the available parts in the Mercedes hoses, pipes and lines category.

For drivers interested in optimizing service costs while maintaining appropriate part quality, a guide article may be helpful – you can find more practical tips in the material on economical vehicle operation using OEM parts.