dreamcast210 said:
OK. What's a case fan? How would I know if I have one in my PC or not? |

This guy right here, under your power supply and above where your graphics card will fit, some PCs which ship without graphics cards have been known to come without a fan there, just have the grate for a fan to be attached but they just rely on passive cooling of air going into the case.
Also never consider cooling a PC by operating it with the side of the case off! if anything the PC will run a lot hotter with the side plate open because it's designed for air flow when the case is closed.
Edit - FML that is some awful plastering of a URL on that picture... tip, never go to my super pc . com lol
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