I have a 95 contour with 2.5 Duratec, Auto and have replaced 4 water pumps in the last 15,000 miles. All have leaked out the weep hole and none have broken propeller, First one came from AutoZone and next two from Ford (with white prop.) and last one from Advance. The rad. fan runs normally and the temp. gauge is always at the N when warmed up. Any ideas? Thanks, scott