Squealing noise, if it is the belt slipping, will Glaze the pulley it is slipping on, this Glazing will cause more slipping and replacing the belt won't help.
Emory cloth can be used on the pulley to rough it up and remove the Glazing.
I would start with crank pulley, as that generates the torque when you change RPMs(cold start 0-1,500rpm and accelerating) so would be the most likely to be Glazed and slipping.
If you turned on AC and heard squealing then AC pulley would be first to check, if turning on headlight or heater fan caused squealing then check alternator pulley, if steering right or left cause squealing check P/S pump pulley, ect.......
Fan belts work on friction, so smooth and shiny will squeal, you can repaint after deglazing as painted surface should be rough when it dries.
Also check inside of current belt, belts can get bad spots, you will see it or them.
Also double check part number for belt, I had a Grandam that had incorrect part number listed from factory, only 1/2" longer but tensioner couldn't keep it tight.
Last edited by RonD; 12-26-2015 at 07:19 PM.