My 1999 Subaru Forester makes a loud slapping noise when the front windshield wipers are on. Also, the wipers don't always park in the same location. Sometimes are they are up a couple inches more than they should be from the bottom of the windshield. I tried replacing the wiper blades but it didn't make a difference. I tried to reposition the wiper arms by unscrewing the nut and then retightening it very tight, but that didn't help. Interestingly, when the wiper blades are parked I can manually move them up and down on the windshield a couple inches. Does anyone know what's causing this and what I need to do to fix it?
Thanks in advance. Mike