Noise 1: My car has been doing this since day 1. I guess its the compressor, thanks !
Noise 2: My car also does this when the AC is on. I only hear it when I'm idling ( probably because the exhaust masks it while driving )
I've had the car for almost 2.5 years now. My AC is always on even when I use the heater, it seems to get rid of the humidity inside the cabin. So other than being annoying, it hasn't caused me any problems.