It is really hot here where I live recently. This is the first summer I have had my model 3 and I have noticed that the AC compressor is really loud.
I can sometimes feel vibration when the AC is cranked up and the fans are going full blast. I don't think it is really noticeable when driving though. Once it gets cool inside, it subsides. I think the AC compressor is just loud. It sounds like a vacuum. I am not sure if this is the same case as you, but that is what mine does. Hope it helps.