I own a fat model PS3 - the kind without backwards compatibility. It was a gift from my cousin who never used it. Part of the reason for that is that the fan could get very loud, to the point of being louder than the tv. I quickly noticed this happening when the game that was being played got heavy to run. With games like SingStar it's fine most of the time, but during boss battles in Bayonetta or at any point when playing GTA V it could go crazy and make an insane amount of noise.
I've been wanting to get a can of compressed air and clean the system for a while now, but so far I haven't done that yet. However, some problems have started occuring a few days ago with the system. My brother was playing GTA V when the console just shut itself off. When rebooted it would give a message that save data may be damaged. It would scan for errors and fix them if they were found, which could take up to 2 or 3 hours according to the message. It was done in 5 minutes. In the last few days, this has happened multiple times, and when rebooted it would either give the save data message or it would say the system overheated.
I have never had this problem before. It started two days ago, and has been going on ever since. You can play for a little while, and then it stops. The only game tested so far is GTA V, but I'm planning on playing some Bayonetta tomorrow. I'll update this message if it crashes on that too.
I'm pretty sure the fan is broken due to all the noise it makes. I'm going to get myself some compressed air and attempt to clean the console with it as soon as possible (I'll blow into the fan from the outside, but I'm not sure I'm actually going to open it up as of now, since I have no experience with that and I don't want to wreck it). Has anyone ever had this problem before? Should I get the fan replaced? I'll update this message when I get more info.