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Regarding the problem you mentioned, it may be because the generator bearing or the water pump bearing is slightly worn. When the engine speed increases instantly, the force acting on the two pulleys is sudden. The increase in air volume causes abnormal noise in the bearings; This may also be due to an air leak in the air intake system. When the air intake volume suddenly increases, a whistling sound appears.
It is recommended to go to a 4S workshop or repair shop for on-site inspection depending on these two situations.
My name is Ma Zengbin, technical director of Boruixiangyun Audi Service Station. The cooling system consists of coolant, water lines, thermostat, water pump, water tank and vents. The problem with your car should be caused by an air blockage indull. You can first clear the internal air blockage and take it for a test drive. Or the water fill tank cap itself is a pressure valve, and if damaged it will also cause this failure.