Help with strange noise Volvo S80 2.5T
 

Two days agio my car begans to do a strange noise. It happens only when the engine is hot and it sounds like a whistling sound that comes from the belt zone and the upper zone of the engine.
It doesn´t depends of engine speed and when I turn engine off it is like a coffee grinder stopping.
Please can anybody hel me?
Volvo 2.5T 2007 strange sound - YouTube