Today I noticed that there was this "leaking" noise comming form my drivers side rear wheel area. By leaking I mean like leaking air, as if my tire had a small hole or something. My car was on when I noticed it, so I turned it off to take a better look. When I turn off the car, the noise is gone. Its only on the drivers side rear wheel area, and its only when the car is on. It was at night time when I heard it so I cant really check and see where its comming from. Any of you have an idea or have this noise also?