How to fix overheating of the fan control of a netbook?

To all Techyv Users:
My eldest son is starting to be annoyed every time he is using his netbook because it is overheating now. And he is hesitant to go to a computer technician to fix his device.
He is afraid that the components of his Netbook might be stolen, or some of his files might be lost. He is consulting IT help on line for this concern, but he don’t sometimes understand the layman’s term in this field.
Rest assure that he is using it on normal usage that it lies on a flat surface.
But he is not certain with the fan control of his netbook if it is still working properly. Is there any ways on how to fix the overheating of the fan control of a netbook?
What are the necessary procedures on how to remove dust from the vent?
Is there a software available on how to fix overheating of the notebook?
Could anyone give me a video clipping on how to fix overheating of the device?
I am looking forward to be heard over this forum and will soon have a solution to this problem.
Thank you very much.
