Well, the fan and the clutch are 2 years old without much driving on them. I was thinking that not driving the car that much (2k in 2 years) made the valve in the fan clutch sticking or so, may be driving more will make things better. But I recall at some point I lost some power after driving through a deep water buddle (on the road). I was thinking that dirst or some water affected the clutch. I started to hear the roar of the fan after that or little later. It is all could be in my imagination.
Thank you all for your help