Please Help!!! My PS3 fan rattles when the the PS3 is running?

I got it 4 days ago but the problem is if i send it to sony to repair then i wont get mine back and mine is new (i got the 80Gb because i liked it more than the new one) but they don't sell them anymore. It is still under grantee what should i do? Should i take it back to argos?