Bleed Line Mercedes W166 Coolant Expansion Tank To Radiator Hose A1665000091

Bleed Line Mercedes W166 Coolant Expansion Tank To Radiator Hose is a cooling system component designed specifically for models in this series. As part of the Cooling system hoses and pipes group, it is responsible for the stable discharge of coolant and air between the expansion tank and the radiator, which promotes proper engine operation. Using an original Mercedes component allows you to maintain factory flow characteristics and geometric fit.

Specifications and technical data

• SKU: A1665000091
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1665000091
• Substitutable numbers: A1665000091, A 166 500 00 91
• Category: Coolant Hoses

Purpose and function in the cooling system

The hose connecting the expansion tank to the radiator in a Mercedes W166 class is responsible for the controlled flow of coolant and the removal of air bubbles from the circuit. As a result, the system maintains stable operating pressure, and the engine's operating temperature remains within a safe range. A properly selected hose minimizes the risk of local overheating, air locks, and unwanted fluctuations in fluid levels.

Advantages of using an original Mercedes hose

Using an original hose in the cooling system ensures:

• precise fit to the expansion tank and radiator connectors,
• properly selected internal diameter and flow path shape,
• stable operation within typical cooling system temperature and pressure ranges,
• consistency with the factory engine bay design.

Thanks to this, you maintain cooling parameters in accordance with the manufacturer's specifications, which is important for both engine durability and the operation of auxiliary equipment.

Performance characteristics and installation

The bleed line between the expansion tank and the radiator in a Mercedes W166 is a component that operates under variable thermal conditions during use. Replacing a worn or leaking hose with an original used component allows you to restore circuit integrity without the need for system modifications. Installation takes place in the factory location, using standard hose routing points, which facilitates service and reduces workshop time.

Importance for engine thermal safety

A functional hose connecting the expansion tank to the radiator has a direct impact on the stability of the coolant temperature. Leaks, micro-cracks, or deformations can lead to fluid loss, air locks, and engine overheating. By choosing an original Mercedes cooling system hose, you reduce the risk of failures resulting from improper flow and improve the predictability of the entire system's operation.

To better understand the impact of individual components on engine operating temperature and component durability, it is worth reading the guide: Engine cooling system – overheating, repair, and used radiators. The article discusses practical aspects of diagnostics and operation of cooling systems in popular models.

Complementary Mercedes cooling system hoses and pipes

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

Summary

Bleed Line Mercedes W166 Coolant Expansion Tank To Radiator Hose is a technically matched cooling system component that supports maintaining a stable engine operating temperature. The original Mercedes design facilitates trouble-free installation and preserves factory coolant flow characteristics. Replacing a worn hose with this component is a sensible solution for service work related to the cooling system in W166 series vehicles.