Also, raise your laptop up a bit, particularly by the air vents. That helps tremendously in keeping it cooler. I frequently use my laptop right on my lap, and I try never to block the vents --- in fact I always try to sit in such a way, that there is nothing preventing the air from being blocked. When the fan goes on, I know that I have to shift position cause I'm obviously hampering air movement. And the result is, within a moment or two, the fan goes off, so this must be working. . .