high pitch squealing noise

Hello, Check for cracking on belts, and see if the noise is coming from any particular component. Likely you just need a new belt, have a bad pulley on one of the belt-driven components, or need to adjust the tension/bad tensioner. Let me know what questions you have, and here is a link in case you prefer to have it diagnosed: http://repairpal.com/oldsmobile-within-10-miles-of-oconomowoc-wisconsin-53066