CmbtEng1981

Hey all just a quick question. I live in IL and own a 2008 Mustang GT with a Saleen Series VI SC and unfortunately have t parked outside while our garage is being refinished. My question is I went to cold start it and let it run when a loud high pitched noise came from the engine compartment. I turned the car off right away because I am just not sure what happened. The temperature has been around 25 or as low as -20 these past couple days. I just hope I didn't do any damage to the Supercharger by trying to cold start it after it's been sitting for a couple days.