I have an Acer 4315 laptop and it seems as though it gets unreasonably hot. Is the problem just a dirty fan, or do I have to buy a new fan or something? Thanks.
Assuming that your fans are spinning, and it is just a matter of turning your laptop over while it is running and see if you can see the fans or feel the air flow.
However, if your system has never been cleaned, I would perform a cleaning.
This is what a laptop may look like, from the inside no air can flow. A normal cleanup may not blow out the dust, so an internal cleaning is best. These are what clean heat sinks are supposed to look like.