Wait a minute, he has a centrino cpu. More than likely, he's talking about a laptop cpu. I don't know if it's such a good thing to crack open your notebook and void any warranty..
Unless, it's not under warranty anymore, in which case, go for it.
just make sure you have new thermal paste.
What cpu number do you have? If you have a core based cpu, then I'd recommend getting coretemp to do the readings. i do not know the reliability of speedfan.