I was fixing to ask a similar question. I have literally used the A/C a few times, I can count on two hands the times I've used it. It's usually raining and the windows are up. I went to pick the lady up for lunch last week so I thought to be a nice guy I'll get it nice and cold before I get there so I was driving with the windows down and A/C on, pulled up to a light was sitting there and heard the A/C kick on for a second, it was loud, didn't sound funny just louder than I remember. I don't think I've ever been outside the truck while the A/C was on. The lady's G8 I thought had a crazy loud A/C but my truck is just a little louder. You can't hear it driving and you can't hear it with the windows up just windows down sitting at a light. Heck it's probably normal and I'm just not use to it.