So it's starting to get warm in SoCal and I'm running the AC more often in my car. I noticed a few weeks ago when I'd set the A/C up to 6 or more I'd get this loud buzzing sound coming from the front of the car and kind of vibrating throughout the cabin. It was so loud I thought I was passing a lawnmower or something. I eventually realized I could make it go away by turning the AC down (or driving around for a few minutes). I sent a few audio samples into my service center and they said "a few technicians listened and said it definitely sounds like the compressor, you should bring it in and we'll see what we need to do to fix it". I made an appointment, brought it in...and....a technician jumped in my car, listened to the sound and said "yep that's the compressor. All gen 1 model S's make that noise, it's normal." and then sent me home. Now that it's even warmer out, I'm noticing the sound kicking in even at a fan speed of 1 with the AC on. It does tend to fade away after driving for a minute or two, but it's a loud sound and one that I've certainly never heard from any other car A/C before. Do all early model S compressors really make loud buzzing sounds when the AC is on? I'm not doubting the technician, but I've been in a lot of cars in my life. Electric and ICE and it's a sound I've never heard before. Just seems like an odd thing to be normal in such an otherwise high-tech car.