Bleed Line Mercedes W177 OM608 Diesel Expansion Tank Right Cooler Shutoff Valve

Bleed Line Mercedes W177 OM608 Diesel Expansion Tank Right Cooler Shutoff Valve is an original component from the Cooling system hoses and pipes group, designed for operation on the right side of the engine bay. It ensures controlled fluid drainage from the expansion tank towards the right radiator and works in conjunction with the shutoff valve, supporting stable engine operating temperatures. This used OEM component is a sensible choice for servicing the factory cooling system in modern diesel-powered Mercedes vehicles.

Specifications and technical data

• SKU: A1775016500
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1775016500
• Substitutable numbers: A1775016500, A 177 501 65 00
• Location on the vehicle: Right
• Fuel type: Diesel
• Category: Coolant Hoses

Purpose and function in the cooling system

The described bleed line works with the expansion tank and the right radiator, as well as the circuit shutoff valve. Its tasks include:

• stable drainage of excess fluid and air bubbles from the cooling circuit,
• supporting the operation of the right radiator under variable diesel engine load conditions,
• maintaining proper pressure in the cooling system,
• ensuring correct cooperation with the radiator circuit shutoff valve.

Thanks to this, the cooling system maintains predictable operating parameters, which translates into safer engine temperatures and a lower risk of overheating during city and highway driving.

Construction and placement on the vehicle

The line is designed for installation on the right side of the engine bay, in the immediate vicinity of the expansion tank and the right radiator. The design is matched to factory brackets and routings, which facilitates installation and reduces the risk of incorrect line routing.

As a Mercedes OEM component, the line is characterized by:

• a dedicated shape matched to the specific architecture of the engine bay,
• ends designed for factory connectors,
• material resistance to temperature and pressure typical for diesel engines.

Such a solution allows for maintaining the factory geometry of the cooling system, which is important for proper fluid flow and the durability of the entire system.

Application in diesel engines

The component is intended for use with diesel units, where the cooling system operates under increased thermal and pressure loads. In diesel engines, it is particularly important to have:

• efficient cooling circuit bleeding at high mileages,
• stable cooling during long-term driving under load,
• maintenance of the proper operating temperature to reduce component wear.

Replacing a worn or leaking line with an original element from the Cooling system hoses and pipes group allows for restoring proper operating conditions without the need for system modifications.

Characteristics of the used OEM component

The offered bleed line comes from disassembly and is a used component. For many users, this represents a favorable compromise between cost and maintaining the manufacturer's original specifications. By choosing such a component, you gain:

• factory fitment for the Mercedes cooling system,
• preservation of the original line routing,
• the possibility of economical repair without giving up OEM parts.

This solution is especially recommended for servicing vehicles used intensively, where both functionality and cost control are important.

Technical support and additional materials

To better understand the impact of functional cooling lines, expansion tanks, and radiators on engine durability, it is worth checking out the guide on cooling system diagnostics and service: Engine cooling system – overheating, repair, and used radiators. The article discusses practical aspects of maintaining the correct engine operating temperature and the consequences of neglect in this area.

If you are planning a comprehensive repair or upgrade of the cooling system area in your Mercedes and need other elements from the same group, such as return lines, supply hoses, or bleed lines, check the available parts in the Mercedes cooling system hoses and pipes category.