Coolant Hose Mercedes W205 Diesel OM626 Expansion Tank Thermostat A6262030802

Mercedes W205 Diesel OM626 Expansion Tank Coolant Hose to Thermostat is a precisely designed component of the cooling system, dedicated to OM626 diesel engines. This used hose ensures proper coolant flow between the expansion tank and the thermostat, supporting stable engine operating temperature and safe operating conditions. Thanks to the preservation of factory geometry and connection diameters, it is a practical service solution for demanding users.

Specifications and technical data

• SKU: A6262030000
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6262030000
• Substitutable numbers: A6262030000, A 626 203 00 00, A6262030802, A 626 203 08 02
• Fuel type: Diesel
• Category: Coolant Hoses

Purpose and Function in the Cooling System

The offered hose belongs to the Cooling System Hoses and Pipes group and is responsible for the controlled flow of coolant between the expansion tank and the thermostat in the OM626 diesel engine. A correctly selected hose in this area:

• stabilizes the coolant circulation during engine warm-up and operating phases,
• limits the risk of local overheating around the thermostat,
• ensures a sealed connection of cooling system components,
• supports maintaining proper pressure in the expansion tank.

For diesel engines, Diesel fuel type implies higher thermal loads, making a properly matched coolant hose crucial for the durability of the entire engine.

Construction and Fit for Mercedes W205 with OM626 Engine

The hose has been designed specifically for the engine bay architecture of the Mercedes C-Class W205 generation with the OM626 unit. The appropriately profiled shape of the hose:

• allows for routing the hose while maintaining factory mounting paths,
• minimizes stress on the expansion tank and thermostat spigots,
• reduces the risk of rubbing against adjacent engine components.

This ensures an organized installation and that the cooling system maintains parameters close to factory specifications, translating to predictable vehicle behavior under various driving conditions.

Benefits of Using an Original Mercedes Hose

The component comes from the Mercedes brand, which translates to adherence to the vehicle manufacturer's quality standards. Choosing an original coolant hose in this part of the cooling system offers:

• certainty of compatibility with the OM626 engine design,
• appropriately selected material resistance to temperature and pressure,
• better fit with factory clamps and connectors,
• reduced risk of leaks due to imprecise fitting.

A used component allows for economical repair while maintaining operating parameters close to those of the originally installed part, which is particularly important when servicing modern diesel engines.

Condition, Service Application, and Operational Aspects

The hose is in used condition, making it an attractive cost-effective alternative for cooling system repairs, especially when multiple components need replacement simultaneously. This type of hose is worth considering in situations such as:

• coolant leaks in the vicinity of the expansion tank or thermostat,
• visible cracks or softening of the old hose,
• preventive replacement during a major cooling system service.

The selection of the correct part is facilitated by available manufacturer markings and related cross-reference numbers, which allow verification of compatibility with the specific engine configuration and vehicle year.

Technical Support and Related Cooling System Components

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 return pipes, main radiator hoses, or short connecting sections, check the available parts in the Mercedes Cooling System Hoses and Pipes category.

To better understand the impact of temperature on cooling system efficiency and the importance of functional hoses, radiators, and fans, it is worth reading the guide “Summer Heat vs. Cooling System: Used Radiators and Fans Guarantee Savings”, which discusses practical aspects of operating and servicing these components.