BMW 3 Series E46 320d M47N Radiator Pack Fan Cooling Unit 7800307

BMW 3 Series E46 320d M47N Radiator Pack Fan Cooling Unit is a complete cooling unit designed for installation in the front of the engine bay, specifically engineered for the M47N powertrain in the 3 Series E46. The original BMW design ensures stable heat dissipation from the engine, supporting the safe operation of the power unit under various road conditions. It is a practical solution for users looking for a proven, used cooling system component with factory geometry and fitment.

Specifications and technical data

• SKU: 7800307
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7800307
• Substitutable numbers: 17007800307, 7800307, 17007791513, 7791513, BG
• Location on the vehicle: Front
• Category: Radiators

Purpose and function in the BMW E46 cooling system

The presented cooling unit is responsible for the efficient dissipation of heat from the coolant and maintaining a stable operating temperature for the M47N diesel engine. Installation in the front of the vehicle allows for optimal use of the airflow while driving, and the integrated fan supports cooling even when stationary or during city driving. Thanks to the original BMW design, the component works with the factory mounting system, hoses, and shrouds, which facilitates service and reduces the risk of incorrect installation.

Construction of the radiator and fan assembly

The unit combines the liquid radiator module with the fan assembly, creating a cohesive package mounted in the front of the body. This configuration:

• ensures predictable airflow through the radiator core,
• facilitates coolant temperature control across a wide range of engine loads,
• reduces the number of separate components requiring adjustment during replacement.

Thanks to the factory design, the proper rigidity of the entire assembly is maintained, which is important given the vibrations transmitted from the engine and suspension. The original cooling system geometry promotes even temperature distribution in the block and cylinder head, which contributes to the durability of the power unit.

Benefits of using an original used cooling unit

Choosing an original, used radiator pack with a fan for the BMW E46 320d M47N is a beneficial solution both technically and economically. Key advantages include:

• factory fitment to the body and mounting system – no need for modifications or adaptations,
• preservation of the airflow and fluid parameters designed by BMW,
• compatibility with other cooling system components, such as hoses, expansion tanks, or fan shrouds.

A used component allows for reduced repair costs while maintaining performance characteristics close to factory standards. This is particularly important for diesel engines, where a stable operating temperature has a direct impact on engine refinement and fuel consumption.

Professional installation and operation

Due to its location in the front of the vehicle, the installation of the cooling unit requires precise positioning relative to the front panel and correct connection of the hoses and the fan's electrical system. It is recommended to:

• check the cooling system for leaks after installation,
• bleed the system according to the BMW service procedure,
• verify fan operation at various operating temperatures.

Such an approach minimizes the risk of engine overheating and allows you to fully utilize the capabilities provided by a functional BMW E46 cooling system. For users who want to learn more about the symptoms of overheating and the impact of the radiator on engine durability, a practical guide has been prepared: Engine cooling system – overheating, repair, and used radiators.

Expansion and modernization of the BMW cooling system

If you are planning a comprehensive repair or modernization of the engine area in your BMW and need other parts from the same group, such as additional cooling modules, related hoses, or complementary liquid system components, check out the available parts in the BMW water radiators category.