I have a 2001 Cadillac Seville STS with 91,000 miles. Recently, while 'driving' the car there is a propeller-like sound that comes from the front half of the car. This sound comes up (or is audible) after the car is driving above 15 mph. The sound frequency/pitch increases & decreases with speed variance. Higher the speed, the more intense is the sound pitch. (It is somewhat similar to putting a card against the spokes of a bicycle and riding, except the sound is more like a propeller of a toy remote airplane). However, when the car is standing idle and I rev up the engine even to high rpm, there is NO sound. It comes up only when the car is driving. I ran the in-dash diagnostic and the problem code ABS C1287 came up, which perhaps is not related to this sound.
Any idea what the problem could be? Will appreciate your feedback.