Mercedes W907 Coolant Radiator Expansion Tank Bleed Line Pipe Hose A9075011300

The Mercedes W907 Coolant Expansion Tank Bleeder Hose is a component designed for precise fluid and air drainage between the radiator and the expansion tank. As an original Mercedes component from the Cooling System Hoses and Pipes group, it ensures proper coolant circulation and stable engine operation under demanding conditions.

Specifications and technical data

• SKU: A9075011300
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A9075011300
• Substitutable numbers: A9075011300, A 907 501 13 00
• Category: Coolant Hoses

Purpose and Function in the Cooling System

The expansion tank bleeder hose in Mercedes W907 models is responsible for the controlled drainage of excess air and fluid from the radiator to the expansion tank. A correctly selected component in this section of the cooling system:

• stabilizes pressure in the coolant circuit,
• reduces the risk of engine overheating,
• supports even filling and bleeding of the system after service.

Thanks to its factory-maintained geometry and internal diameter, the hose integrates seamlessly with the original radiator and expansion tank spigots, facilitating installation and minimizing the risk of leaks.

Construction and Fit for Mercedes W907

This hose belongs to the Cooling System Hoses and Pipes group, meaning it is designed for resistance to coolant operating temperatures and typical pressure loads in modern powertrains. Its shape and length are tailored for installation in the Mercedes W907 engine bay, considering routing along factory brackets and covers.

The original hose ends allow for a secure fit onto the spigots without the need for modifications, which is crucial for fleet vehicle servicing where assembly consistency and predictability are key.

Benefits of Using an Original Cooling Hose

Using a bleeder hose that conforms to the factory specifications in a Mercedes W907 translates into several practical benefits:

• Cooling System Compatibility – maintains proper flow between the radiator and expansion tank without altering the system's design.
• Stable Engine Operation – correct bleeding minimizes localized overheating and fluctuations in operating temperature.
• Service Safety – a hose designed to operate with factory pressure and temperature reduces the risk of failure during use.

This solution is particularly recommended for vehicles used intensively, where maintaining an efficient cooling system directly impacts engine longevity and predictable vehicle performance.

Condition and Service Application

This part is an original Mercedes component offered as a used item, allowing for economical repair of the cooling system while maintaining compliance with the factory design. This type of hose is suitable for replacing a damaged section of the system as well as for comprehensive cooling system servicing after an engine failure or overheating incident.

In workshop practice, the expansion tank bleeder hose is often replaced along with the radiator, expansion tank, and other flexible sections of the system to restore full sealing and proper coolant circulation in a single operation.

Technical Support and Additional Resources

To better plan cooling system service and understand the impact of individual components – including hoses and pipes – on engine durability, it is advisable to consult the guide: Engine Cooling System – Overheating, Repair, and Used Radiators. The article discusses typical overheating symptoms, the importance of proper coolant circulation, and practical tips for selecting used components.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and require other parts from the same group, such as return hoses, supply hoses, or bypass hoses, check the available parts in the Mercedes Cooling System Hoses and Pipes category.