could it be your HVAC vents cycling to a neutral position? Just wondering, because every time I start mine I have noticed the vents seem not to be in the position I left them in...they have to reset themselves.. but then I have never heard any sounds after I shut the car off.
Cancer's a bitch! Enjoy life while you can! LIVE, LOVE, DRIVE...CAMARO!
Previous Camaros: 1974, 1979 and 2010.