Audi A4 B8 Water Hose Cooling Radiator Coolant Pipe Line 1.8 TFSI 06H121085C

Audi A4 B8 Water Hose Cooling Radiator Coolant Pipe Line 1.8 TFSI is a component from the Cooling system hoses and pipes group, designed for use in the 1.8 TFSI petrol engine cooling system with an automatic transmission. It ensures a tight and stable flow of coolant between the radiator and other components, which translates into a safe operating temperature for the engine unit.

Specifications and technical data

• SKU: 06H121085C-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 06H121085C
• Substitutable numbers: 06H121085C, 06H 121 085 C
• Fuel type: Petrol
• Gearbox type: Automatic
• Category: Coolant Hoses

Purpose and function in the cooling system

The presented hose is designed for use in the 1.8 TFSI petrol engine cooling system in the Audi A4 B8 model equipped with an automatic transmission. It is responsible for the controlled flow of coolant between the radiator and engine components, maintaining stable thermal conditions during city driving, highway driving, and while under load.

A properly selected water hose minimizes the risk of overheating, leaks, and pressure drops in the system. As a result, the engine maintains the correct operating temperature, which promotes its durability and the proper operation of accessories.

Construction and fitment for Audi

The hose is manufactured as a part dedicated to the specific configuration of the 1.8 TFSI unit with an automatic transmission, which facilitates installation at factory mounting points. The shape and diameters of the connections are adapted to the original radiator ports and engine components, ensuring the hose is routed correctly in the engine bay without tension or unwanted kinks.

Such a fit reduces the risk of rubbing against other components, thereby decreasing the likelihood of premature wear. Stable coolant flow promotes even temperature distribution throughout the entire system.

Benefits of using an original radiator hose

Using a hose designed for the Audi A4 B8 with a 1.8 TFSI petrol engine and automatic transmission allows for maintaining the factory characteristics of the cooling system. This is particularly important in turbocharged units, where thermal loads are higher than in simpler naturally aspirated designs.

• Compatibility with the factory cooling system – the hose works with the original radiator and engine accessories.
• Proper coolant routing – limits local overheating of engine components.
• Better temperature control in city traffic and at higher speeds.
• Ability to maintain the stock configuration without the need for modifications.

Condition and service application

The item comes from disassembly and is intended as a service part for replacing a worn or leaking hose in the cooling system. It is suitable both for standard repairs after a failure and for the preventive replacement of rubber components in older Audi A4 B8 vehicles.

Selecting a hose compatible with the petrol engine and automatic transmission configuration facilitates the mechanic's work and reduces installation time, which is important during comprehensive work within the cooling system.

Technical support and additional information

If you are planning a comprehensive repair or upgrade of the cooling system area in your Audi and need other components from the same group, such as additional pipes, return hoses, or sections connecting to the radiator, check the available parts in the Audi cooling system hoses and pipes category.

To better understand the impact of a functional radiator hose on engine durability and the symptoms of overheating, it is worth reading the guide: Engine cooling system – overheating, repair, and used radiators. This will make it easier to assess when replacing hoses and pipes is necessary and how to prevent more serious engine damage.