Yikes, Sony VAIO PCG-GRZ660 Overheating

[rebelfallen]

My VAIO has been over heating for some time now, but I never use it so
I have been ignoring it. However now it is rendered useless. I run
Ubuntu linux on it, and after 20 minutes it shuts down and spews
Overheating errors on the screen.

I assumed it was the fan so I opened it up but the fan runs. I have
bought an Antec notebook cooler to help but do you know what else it
could be?

 

[Clint]

Didja blow the dust-bunnies out of it?

Clint

 

[Jan Alter]

Didja blow the dust-bunnies out of it?

Clint

Could there be more than one fan on this machine and that one needs cleaning
as well?