Hamid,
Excellent. I just have fixed my washer/dryer. Here is how I did it: first, genly tried to rotate the fan using nut, which is keeping wheel for belt joining fan and motor. It exposed resistance and required some slight force to be applied.
Few drops of oil in between of the belt wheel and fan housing helped to turn it with no force nearly. Repeated many turns manually to let oil do it's work. Then, pushed red square thermostate overheating fuse you mentioned, until cliked. While machine was running, I added few drops of oil more until fan stopped whining and now is running smoothly.
Thank you so much for tips.
Emilk, August 2009