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Strange noise while charging

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Most EVs (other than the Leaf) including Models S/X/3 use some form of active battery thermal management which will run pumps and fans even when the car is off and not charging, if the battery temp is out of an acceptable range. That sounds like a fan, but it sounds a bit like a fan with something stuck in it. If it continues to sound like that, I'd take it in. If it stops, maybe it just got a leaf in it.
From my experience, that's the noise from the HVAC system used to cool the battery. However, the Model 3 i drove did not sound that "scratchy" but rather like a steady buzzing.