BMW G20 G21 G22 G23 G28 G42 Radiator Cooling Fan Motor Unit 8591441

The BMW G20 G21 G22 G23 G28 G42 Radiator Fan Motor 8591441 is an original part from the Fan and Blower Motors group, designed for the cooling system of modern BMW 3 and 4 Series models. It ensures stable operation of the radiator fan, supporting the maintenance of the correct engine temperature in urban and highway conditions. A used OEM component is a sensible choice for drivers seeking factory fitment and predictable performance parameters.

Specifications and technical data

• SKU: 8591441-2
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8591441
• Substitutable numbers: 8591441, 17428591441
• Category: Fan Motors

Purpose and Function in the Cooling System

The radiator fan motor is responsible for driving the impeller, which forces airflow through the radiator, especially at low driving speeds or when stationary. In BMW G20, G21, G22, G23, G28, and G42 models, this component works with the engine control system and temperature sensors to:

• maintain stable engine operating temperature,
• reduce the risk of overheating in traffic jams and during spirited driving,
• support air conditioning efficiency under high thermal load.

Thanks to its factory design, the motor is matched to the airflow characteristics in the engine bay, which translates to consistent and predictable cooling system operation.

Advantages of Using an Original BMW Motor

Choosing an original radiator fan motor for your BMW offers a range of practical benefits for everyday use:

• Factory Fitment – the component comes from the same design line as other cooling system elements, minimizing the risk of installation issues.
• Consistent Operating Characteristics – rotational speed and response to control signals are in line with the vehicle manufacturer's specifications.
• Thermal Stability – a properly functioning motor supports even heat dissipation from the radiator, which is particularly important in modern high-density power units.
• Sensible Cost-Quality Compromise – a used OEM part allows for high manufacturing quality at a lower cost than a new part.

Installation and Operational Characteristics

The radiator fan motor from this series is designed as a component for direct installation into the factory fan bracket. This ensures a streamlined installation process in compatible BMW models, without the need for structural modifications. The design intended by the vehicle manufacturer promotes:

• maintaining the correct position of the impeller relative to the radiator,
• proper routing of power and signal cables,
• maintaining adequate mounting rigidity under vibration and temperature changes.

A used component allows for the restoration of correct cooling system operation when the existing motor shows signs of wear, such as noise, irregular operation, or no response when the fan is activated.

BMW Fan and Blower Motors – Expansion and Modernization

If you are planning a comprehensive engine area repair or modernization for your BMW and need other parts from the same group, such as radiator fan drives, cabin blower units, or auxiliary motors, check the available parts in the BMW Fan and Blower Motors category.

Technical Support and Knowledge about BMW Units

When diagnosing overheating problems or unstable cooling system operation, it is worth taking a broader look at the condition of the entire powertrain. For users interested in a wider context of BMW unit operation, a practical guide has been prepared – you can find more information in the article BMW E90 Faulty Engines: Check What Can Ruin Your Budget. This will help you better assess when replacing components like the radiator fan motor is part of a broader service strategy.