Lately I have noticed that my Model S (built in August 2016) makes a very loud noise when charging from the Tesla wall connector (at both 40A and 48A). It's very quiet in the beginning, and then after 1-2 hours the fans turn on to cool the battery and the noise gets so loud that you cannot carry a conversation if you stand next to the car! It's definitely louder than what I heard while charging at a supercharger. The problem seems to be that the louvres remain closed when the fans turn on, and the air seems to be escaping around the closed louvres making a loud noise. If I unlock the car while it is still charging, get in the car and turn the AC on, both louvres open and the sound diminishes considerably - you can still hear the fans running but it's much quieter. When the fans turn on to cool the battery while I am at a supercharger, the louvres open immediately. So the problem comes up only while charging in my garage. Have any of you noticed the louvres remaining closed when the fans turn on while charging at home?