2012 Jetta Noise
 

Hey guys new to this forum but about 3 weeks ago i bought a new 2012 Jetta SE. Everything is great except for some noise i hear from the cabin sometimes. You know when you start your AC and it makes the revving noise a little bit? well thats the noise it makes just driving. and when i turn the AC on it goes off. The sound comes and goes and sometimes its really loud. The longer i drive the more prone it is to being loud. I have no idea what it is. I feel it has to be related to something with the AC if turning on the AC makes the noise go away. anyway any ideas just shoot.