Has anyone else noticed a very loud hum when using your air conditioner? I am assuming it is the compressor running but it can easily be heard a good 5-10 feet from the car. It is coming from the far left side of the engine compartment when facing the car and even causes a slight but noticeable vibration in the car. It will start almost as soon as you turn on the A/C and then gets louder until it is just down right irritating. After 10-15 minutes of running then it will shut off, but starts right up again if you turn off the system. This is my first prius and I am not sure if this is normal or not. I took it in and a couple techs listened to it, but of course it was much better behaved around them. They set up an appointment for one of the prius techs to look it over but admitted they had yet to work on any 2010s. I'm just worried that they will come back and say it is nothing and then down the road I'll end up with a bigger problem. Thanks!