Why is the engine cooling fan making an unusually loud noise?

[AshleyRose]

It is normal for the engine cooling fan to make a particularly loud noise. When the temperature of the engine coolant rises, the noise from the cooling fan increases due to the higher rotational speed. Additionally, when the car's air conditioning is turned on during hot weather, the fan noise also becomes louder as it needs to dissipate heat from the condenser. The engine cooling fan is installed between the engine and the radiator. When the fan blades rotate, driven by the engine, they generate high-speed airflow, which carries away the heat from the coolant in the radiator, thereby achieving the purpose of cooling the engine. Engine cooling fans can be divided into two types: mechanical fans and electric fans. Mechanical fans are designed to reduce engine power loss and save fuel. Most engines use fan control devices to manage the engagement and disengagement of the cooling fan with the drive pulley. Electric fans, on the other hand, do not operate when the engine is at low temperatures; they start rotating only after the temperature rises, and they are driven by an electric motor.