My Ps3 makes a loud fan noise after 15-20 minutes

If it's an older system, break that thing open and clean it! ^^ If it a newer system, or you just don't feel like stripping it to clean it, then use an air compressor to blow the crud built up in the back of the system. Make sure the compressor hose is dry, as you don't want water to get inside your system. Good luck, and I hope this helps.

My guess is its going to die soon. I would back up most of your stuff on a hard drive if possible. If it gets that far. I had this happen to my 40GB PS3 about a year ago. It turned on for 5 minutes then off. Soon after that it didn't turn on. And it was making really loud fan noises.
What are the specs of your PS3 and was it making loud fan noises before? Consider buying a new PS3 slim?
A quick guess that i just thought is try doing the fan test before turning it on. Turn Off PS3 completely (switch in back) Hold eject button and Turn on switch.

NOTE: This is dangerous and can harm the PS3.

Good Luck

Don't do anything your fan is just fine it's just running faster to keep it cool when you hear a clicking sound at high speed then you should be worried about it cause your fan is failing and should be replaced

well the noise is a loose nut or could just be the fans,and/or reading cds........but if it won't read some ps3 games......well idk

The ps3 could be overheating if the fan is not working, make sure the fan is clear of any obstructions and dust, the fan will need changing if it doesnt fire up.

It sounds like it needs to be cleaned, just blow some compressed air into the fan area, unless you can actually get it opened, then that would be better.
Hope this helps!

Does the PS3 still work while the fan is running. This is typical with PS3, especially if the fan is dirty. It comes on and off to cool down the processors.

i had the same problem once make sure that the ps3 is not on a carpet, or move it to a hard suface and a more ventilated area,, that is probably the best solution since the ps3 requires alot of cooling down.

hey thats very nice of you to tell us all that. thanks. :)

It is your outake fans. most likely bearings or something is lodged close to one and doing the old popsicle stick in the spokes trick to you.