Driver's side, radiator side, under the "duratec" plastic cover. Driven by its own belt off of the cam. Tensioner pulley in the middle is undone by hand (swing it around to loosen the belt) WP is removed with 8 bolts (keep track of which were longer, so they can go back in the right holes..) remove, clean gasket material off the block, add new gasket, add new WP, reinstall..
top off coolant..
MAKE SURE YOU piece together you broken impellar, so there are no pieces "missing" in your system somewhere..
Ray