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Like @tpham07 wrote, turn off the climate control. I bet it stops. My S sounds similar, but settles down in a few minutes.
Every summer there are complaints that the Tesla A/C is very loud. This was a very hot summer here in Houston and I've noticed a lot of ICE cars with their A/C on sitting in parking lots. They're every bit as loud, I have to admit.
#1. If your barber's clippers sound like that, please get a new barber.
#2. These cars don't have engines.
#3. I agree with the others, sounds like HVAC.
Tesla's service center would have the best answer, however I "do" have a suggestion.
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I believe its the little man in the fender that drives the scale model 3 that we were all supposed to get.
I didn't get a scale model...so....I don't have a little man to make that noise.