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What is the reason for the buzzing sound from the Audi Q3 engine after turning it off?

1 Answers

DeCaden

07/24/25 5:43pm

Audi Q3's engine buzzing for a while after turning it off is the sound of the electric fan running at high speed. This situation is normal. After the engine system temperature drops, the cooling system will automatically stop working, usually taking 3 to 5 minutes. When the engine temperature is too high, even if the car is turned off and the key is removed, the cooling system will still automatically start to cool the engine system. Additional information: 1. Introduction to car electric fans: Car electric fans are controlled by the engine coolant temperature switch and usually have two-speed levels: 90°C for low speed and 95°C for high speed. Additionally, turning on the air conditioning will also control the operation of the electric fan (condenser temperature and refrigerant pressure control). One type is the silicone oil clutch cooling fan, which relies on the thermal expansion characteristics of silicone oil to drive the fan; another type is the electromagnetic clutch cooling fan, which uses the principle of electromagnetic field attraction to drive the fan. 2. Function and principle: The main advantage is that the fan is only driven when the engine needs cooling, minimizing the energy loss of the engine. The car fan is installed behind the radiator and pulls air from the front of the radiator when turned on; however, some models have fans installed on the front outside of the radiator, blowing air towards the radiator. The fan starts and stops automatically based on the water temperature. At high speeds, the air pressure difference between the front and rear of the vehicle is sufficient to maintain the water temperature at a certain level, so the fan may not need to work at this time.

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