Ok, try this first: run the fan at 7 volts. It won't cost anything and is something you can undo. To accomplish this, you will need to attach the fan's black wire to the red wire on the power-supply harness. Another option is to go halfway and put a new fan on the heatsink.
I tried some stuff like that Vblock. Don't waste your time if you have a Delta38 fan in there.