I was running my AC on 3 and I heard a loud pop then what sounded like a spring from the area under the glove box. Ever since then if I put my AC on 3 it is a loud vibration noise from under the glove box and if I put it on 4 it is extremely loud. Also while the air is cold it does not blow much harder on 4 then it does on 2 so I have trouble cooling my truck. When you turn it up it sounds like it is blowing harder but it doesn't really blow harder. Anyone have any ideas what the problem might be. My truck is a 2009 Colorado 2wd Z71 crew cab.