First time poster. Have owned a 2005 Crossfire for little over a year. Very little mileage. Today, for the 1st time, I heard a whistling sound (very shrill sounding) coming from the air vents. It is not continuous but off and on. When it happens, shutting off the a/c makes it stop. But once the a/c is turned backed on, it happens again within a few seconds.

No warning lights have come on. Any ideas or suggestions are welcomed. rw