Hello everyone, I recently got a 2018 640i and I've noticed a weird sound after driving and shutting off the engine. It's like a high pitch buzzing sound coming from the grill area. The sound goes away when the engine bay cools off. But when it's warm from driving it makes a buzzing noise every 1-3 minutes. I've liked a YouTube video of the sound. Anyone else have this noise? Is it normal? Thanks.
https://youtube.com/shorts/X8YHQqOtq5M?feature=share