As others have mentioned before, the issue seems to be directly related to the AC unit and the level at which it's running. I for one have been experiencing this issue since purchasing my 2016 S and can confirm it gets more or less noticeable with AC intensity/temperature variation, but want to note that of the four Base 4 cylinder models I've driven, not a single one has had these symptoms. I am curious to see if the AC compressor is located in a different place on the S as opposed to the Base, due to less space around a larger engine.Hi Dean,
I can confirm i am also having this issue on a 2019 S, i originally wrote it off as normal until i read this thread. Would be very interested to hear of a fix
Regardless it seems this may be a noise and vibration insulation issue.