Have a 2005 Hyundai Sonata and for the last year it has a high pitch squeak almost always when the engine is running. I had it into the shop three or four times and they tried to get the squeak to stop. The accesory belt idler pulley was replaced and also the tensioner pulley bearing has been replaced. A new pull was put on and we were also told to use a wire brush on the belt when the squeaking starts again. This above repairs usually only worked and kept the squeak quiet a week or two. Even when the wire brush is used it now only stops the annoying noise for a day or two. The car is in really good shape and looks nice but I have to have the music playing very loud and can't have the windows or sunroof open because of the awful noise. I also don't like to go the drive up windows because of the squeak. Any suggestions would be quite appreciated. Dena