High Pitched Frequency Noise
I've taken my 2011 528i to the BMW dealer several times to try and find out what is causing a high pitched frequency noise that you can only hear from inside the car, but they can't figure it out. They thought it might be coming from the A/C system and replaced the blower motor and upper air distribution box, but the noise was still there. They recently replaced the computer that operates the audio system, but the noise was still there. When the noise does occur, it happens at any speed and goes away when I press the breaks and come to a stop. Has anyone experienced this or have any suggestions on what it could be? Thanks.
Last edited by bmw2012; 03-05-2012 at 07:52 AM.