My 1999 Chrysler Sebring Lxi coupe has started to produce a whistling noise while in motion. The car has the standard V6 engine and auto transmission. It has 122K miles. The noise seems to be coming from the passenger rear. It only happens when the car is moving. The noise is not present if the car is idling and not moving. I have jacked up the rear passenger tire and spun the wheel by hand to try to reproduce the sound, but only get a small scraping sound. This sound does not appear to be affected by turning in either a right or left direction while the car is in motion. I am overdue to have the rear brake pads replaced and am wondering if this can be the cause in some way of this noise. The noise is not directly related to the operation of the brakes as I have not noticed any evidence of this when the brakes are applied. Help is appreciated.