Internal fan issues

I have noticed that the fan in my macbook makes really loud noise when I turn the computer on, even when its really cool to touch. Also the fan is triggred on when I put it on any surface, when I am typing it turns off and as soon as I stop typing it turns back on. My apple care protection plan has expired, can someone please point out the problem and suggest what I should do to fix it.
Thank you.

I was able to resolve the fan issue. Just had to open the macbook and clean out the accumulated dust. Tedious work but worth it, works as good as new.
Followed these links:
http://www.youtube.com/watch?v=fQY3YuCHLqo
then to remove and clean the fan:
http://www.youtube.com/watch?v=7bDRM1G3fSI

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