hey new guy here i came on here looking for answs to my annoying squeak wich is the same discription of yours ive replaced 2 water pumps in the past week(refurbished) and when i take off the belt and spin the pully by hand it makes a sound similar to a duck. one of the problems it is causing is its leving a black residue from the serp belt on the tensioner pulley. just thought id give my imput, i hope you fix yours and if you find waht it is an let me know that would be great.