How to clean a laptop fan?
You should look on a site like http://www.laptopka.com/ to see exactly how to take your laptop apart to get to the fan area. Then once you get there, you should use a can of compressed air, available at staples or similar office supply store and in bursts of a few seconds, blow the dust away. You should use a straight object to hold the fan blades in place because blowing them with the air causes them to turn too fast for the bearings and could ruin the fan. Also, blow the dust off outside since your house would get all dusty. Note that during cold weather, the compressed air will seem like it stops working, you just need to warm it up again.