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I’ve searched this forum as well as M3OC and reddit without success.
My model 3 makes a periodic clunking or thunking noise when supercharging, around every 3 minutes or so. If I’m sitting in the driver’s seat, it feels like it’s coming from the right rear or the rear center. I can hear it and it actually vibrates the car enough that I can feel it.
It’s definitely NOT the same sound as the two-click high voltage connectors clicking on when I first unlock the car—it’s a single clunk and it’s a lower pitch. It’s happened with pretty much every SOC.