Hey everyone. Recently I've noticed that when I switch on my A/C, I hear a very noticeable "clunk" sound. It only does it when it turns on. The A/C still blows cold and I haven't noticed any other problems, but the loud clunk really concerns me. I can also feel it. It feels like it is coming from below the car, but that just might be the vibration I'm feeling. Any ideas? Thanks very much!