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Loud buzzing/gargling sound when charging

I've just pluggged the car in to my wall connector for the first time in a couple of weeks to charge it. It's at 55%, it's about 50 degrees outside. It's says it's charging at 48A, but it immediately strarted making this noise from the rear portion of the car. It's a little louder underneath. Any ideas? Something stuck in a cooling fan? Currently trying to sell this so the last thing I want to do is have to wait for the SC to fix something :/. Vid posted here
Just out of curiosity, did you listen to the video? I've had the car 3 years and not heard that before, tho granted i usually have scheduled charging on, so it charges at midnight.
Sure I did, and I immediately recognized the same warming up sound I heard when I charged my Y a few weeks ago in cold temp.

When the battery pack is cold and you start charging, it always makes the same mosquito-like buzzing sound you heard. I guess you're not sitting right next to your car at midnight when scheduled charging starts so it's possible this was the first time you ear-witnessed this (scary) sound, even in three years!

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