I have not had the issue with people being able to hear me unless the AC fan is running full blast. --- so I have learne dot turn down the fan. My old car actually automatically turned the fan down when you were on the phone. My issue seems to be that on long drives where I am talking or on a conference call for up to an hour or more (with the acutal Blackberry 9650 volume max) that the phone volume within the Sync system turn downs periodically so that I am readjusting it up every 5-7 minutes just to hear the person on the other end.