I hear whining noise, or something like singing of the wind, medium pitch. It is not loud, it sounds like wind. It occurs when I drive at some specific speed somewhere between 62-67km/h. No matter what gear is, third, fourth or fifth. I hear it always at those speed interval. In the fourth gear (where these speeds belong) it is the clearest sound. If I press clutch pedal, the sound immediatelly stops. It never occurs at other speeds. What it could be? It drives me crazy!!!!