My 1993 Buick Century has begun making a whistling sound. It is a constant monotone, like a boiling tea kettle but not as loud or as high-pitched.
As best I can tell it coming from the rear of the car, or perhaps the middle, on the underside. It is constant regardless of rpms or whether the car is moving or stationary. The only way I can make it change is gets just a little softer if I apply the brakes (the brakes are working fine btw). Anyone have any ideas for me? Thanks a lot!