overheated laptop

[sly]

i have 2 laptops: a dell inspiron 8000 (p3) and a dell inspiron 5100 
(p4). the p3 has fc2 and runs perfect! on the other side the p4 had fc2 
and had overheating problems. now i installed fc3 and it still has 
overheating problems. the fen runs continuously and the temperature is 
at 68C average. sometimes it reaches the critical 80C and it shuts off. 
i wasn't able to find any helpful info on the web or i just didn't know 
where to look. any helpful info would be appreciated.