A reminder to anyone reading these fan issue threads... if this has been an issue with your laptop for more than a couple of years I highly recommend checking for lint buildup in the fan and fan enclosure.
My 8510w had always had a fan that seemed to work overtime but it eventually reached a point, after about two years, where it just ran constantly and temps seemed to be increasing. Since the fan runs on this machine more than is considered normal for most laptops it was accumulating dust/lint far more quickly than would be expected as a result. And I do not work in especially dirty or dusty environments.
I simply put a toothpick in the fan blades to keep them from rotating (spinning too fast) and applied light vacuum from a vacuum cleaner pulling in reverse of normal flow. An astonishing amount (seriously) of plugged up lint emerged and I had to remove it with tweezers through the fan grille and reapply the vacuum a couple more times to clean it thoroughly.