So for the past couple months or so I've noticed my air conditioning has been very loud. By very loud, I mean that I can hear it across the parking lot, in the house and it's very loud while driving. It's like a jet engine starting up! After it cools down, the sound gets quieter. Also happens when charging and supercharging. I've never heard an S this loud. Cooling works, but it and the heat sort of slow down when I stop the car at a light and pick back up when I begin to move. I also get a vibrating noise at a certain fan speed. Any thoughts on what could be the issue? Probably time for my bi-monthly trip to the SC. Thanks a lot.