Bleed Line Mercedes W205 Coolant Expansion Tank Shut Off Valve A2055013801

Bleed Line Mercedes W205 Coolant Expansion Tank Shut Off Valve is an original cooling system component from the Lines, hoses and pipes group, designed for use in Mercedes W205 series vehicles. It is responsible for the controlled removal of air from the coolant circuit, which promotes stable engine operation and reduces the risk of overheating. Thanks to its factory origin, the line ensures a proper geometric fit to the cooling system in this model.

Specifications and technical data

• SKU: A2055013801
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2055013801
• Substitutable numbers: A2055013801, A 205 501 38 01
• Category: Hoses, Lines & Pipes

Function in the cooling system

The bleed line in the Mercedes W205 cooling system plays a vital role in maintaining proper fluid circulation. It allows for the removal of air bubbles from the circuit, which:

• stabilizes pressure in the cooling system,
• reduces local overheating of engine components,
• supports even distribution of coolant,
• decreases the risk of cavitation in the liquid pump.

As a result, the cooling system operates in a more predictable manner, and the engine maintains its operating temperature within the intended range.

Construction and fitment for Mercedes W205

The original coolant bleed line for the Mercedes W205 is designed for specific routing in the engine bay, taking into account factory mounting points. The properly selected internal diameter and shape of the line ensure:

• correct medium flow in the bleeding zone,
• compatibility with cooling system connectors,
• easier installation without the need for modifications.

Precise fitment to the body geometry and engine accessories in the W205 reduces stress on the connections and promotes longer, stable operation.

Characteristics of the used component

The offered line comes from the dismantling of a Mercedes vehicle, which means it is a used part that retains its factory design specifications. In practice, this means:

• retention of original geometry and connection diameters,
• compatibility with factory brackets and routing in the engine bay,
• suitability for use as a replacement for a damaged line in an existing system.

Choosing an original, used component from this group allows you to maintain the consistency of the cooling system with the solutions provided by the vehicle manufacturer.

Service application and installation

The coolant bleed line in the Mercedes W205 is particularly useful during service work such as radiator replacement, main line repair, or liquid pump maintenance. Replacing a worn or leaking line with an original component from the same group:

• reduces the risk of air locks in the system after refilling with new fluid,
• facilitates proper bleeding after repair,
• helps maintain stable engine performance parameters in the long term.

Due to the specific routing of the line in the engine bay, installation according to the factory path, using the original mounting points, is recommended.

Complementary Mercedes lines, hoses and pipes

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as main coolant lines, flexible connecting hoses, or additional bleed pipes, check the available parts in the Mercedes lines, hoses and pipes category.

More about the advantages of used OEM parts

If you want to better understand how the use of used OEM components – such as cooling system lines – affects vehicle downtime in the workshop and service costs, it is worth reading the article: Availability of car parts off-the-shelf vs. repair time – how used OEM parts shorten workshop stays?.