Audi RS4 B8 4.2 TFSI CFSA Motor Engine Coolant Radiator Intercooler 8K0121251AB

The Audi RS4 B8 4.2 TFSI CFSA Motor Engine Coolant Radiator Intercooler is a component designed for efficient heat dissipation from the cooling system of a petrol engine. A properly selected and functional heat exchanger stabilizes the engine temperature, which translates into safe engine operation, power retention, and a reduced risk of costly failures.

Specifications and technical data

• SKU: 8K0121251AB-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 8K0121251AB
• Substitutable numbers: 8K0121251AB, 8K0 121 251 AB
• Fuel type: Petrol
• Category: Radiators

Purpose and role in the cooling system

The presented water radiator was designed for the 4.2 TFSI petrol engine in the B8 generation Audi RS4, where the cooling system operates under high thermal load. The radiator's task is to effectively transfer heat from the coolant to the environment, ensuring that the engine's operating temperature remains in the optimal range even during dynamic driving.

In combination with other cooling system components, a properly selected radiator:

• stabilizes engine temperature during high RPMs and heavy loads,
• reduces the risk of overheating and engine seizure,
• supports the maintenance of proper lubrication and combustion parameters.

Benefits of using an original Audi water radiator

Using a component from the Water radiators group dedicated to a specific Audi model ensures proper fitment in terms of dimensions, connector placement, and flow characteristics. This makes installation predictable and ensures the cooling system maintains its factory functionality.

Key advantages include:

• maintaining the factory cooling characteristics of the petrol engine,
• compatibility with original cooling system hoses and accessories,
• reducing the risk of leaks resulting from poorly fitted aftermarket replacements.

Component condition and installation aspects

The offered water radiator is a used component, which in practice means an economical way to repair the cooling system while maintaining the original design. Before installation, it is recommended to perform a standard check for leaks and channel patency, as well as to inspect cooperating components such as hoses, clamps, and temperature sensors.

During installation, it is worth paying attention to:

• proper bleeding of the cooling system after filling with fresh coolant,
• checking the operation of the fans and thermostat after the first start-up,
• verifying that there are no leaks at the hose connections.

Part selection by numbers and parameters

To ensure compatibility with a specific version of the Audi RS4 B8, it is recommended to select the radiator based on the OEM part number and interchangeable numbers, as well as to verify it against the fuel type – in this case, it is a petrol engine. This approach minimizes the risk of purchasing a component with different dimensions or a different connector layout.

In case of doubt, it is worth comparing the design of the offered radiator with the component removed from the vehicle, paying attention to the placement of mounts, connectors, and additional attachments.

Cooling system expansion and related components

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other elements from the same group, such as additional heat exchangers, coolant hoses, or mounting hardware, check the available parts in the Audi water radiators category.

To better understand the impact of a functional radiator on engine durability and the symptoms of overheating, it is worth reading the guide: Engine cooling system – overheating, repair, and used radiators. This will help you better assess the condition of your current cooling system and make an informed decision about replacing components.