Make sure the belt is routed properly. There's usually a diagram somewhere under the hood- - - - -if one of the heavy load pulleys like the crankshaft pulley, alternator, or the A/C compressor doesn't have enough of the belt wrapped around it, it will squeal. Since it's only happening after startup, pay particular attention to the alternator. Recharging the battery after startup puts a lot of load onto a very small pulley.
Jerry
