Lexus ES350 flutter noise when AC is on resembling a card in bicycle spokes on Lexus ES350

Some Lexus ES350 owners report experiencing a flutter noise similar to a card in bicycle spokes when the AC is on, which may be attributed to several common issues. This noise could stem from worn-out bearings in accessories like the alternator, water pump, or power steering pump. Additionally, some owners find that a loose accessory belt, such as the steering or AC belt, may be contributing to the sound. It is also advisable to check the AC clutch for lubrication or a starting bearing, as this could help pinpoint the noise's source. To effectively address this issue, owners are encouraged to inspect these components and consider necessary repairs or maintenance.