The other day I started my car up and it gave off a high pitched squill. I thought it was the serpentine belt so I changed it. Still was loud. Changed the idler pulley and it got a little quiet but still hear the high pitch while is idling and when I give it gas. Any suggestions. 2012 Charger.

 

Let the engine idle, and go poking around, see if you can tell where the sound is coming from. (a short length of hose will help here, use it like a stethoscope.)