How do you change an idler pulley on a 1995 Cadillac Seville sls?

To change the idler pulley on a 1995 Cadillac Seville SLS, first, disconnect the negative battery cable to ensure safety. Remove the serpentine belt by using a wrench to relieve tension on the tensioner pulley. Next, unbolt the idler pulley from its mount using the appropriate socket, and replace it with the new pulley. Finally, reattach the serpentine belt, ensuring proper routing, and reconnect the battery cable.