So I started my p5 today, warmed it up and drove to work. I turned the AC on 1 dial, and got on the freeway. About 10 minutes and 10 miles later, I notice that white smokes are coming out of the AC vent occasionally. I smelled it and it's not a burn smell, the AC was still cold. The smoke would show up once a while, but temp guage still stay the same, no burn smell, so I don't think it's the radiator. What could it be?? My car is pretty much stock, with only a mod pipe, muffler and rims. 2002 p5. slightly under 60,000 miles