If the fan is ok other than the noise, you can 'silence' it.
Remove the fan and screws, and pub blobs of silicone sealant on the screw holes of the fan and the corresponding spots on the heatsink. squish the fan onto the heatsink using spacers of about 1cm. remove the spacers after it dries, the fan will be attached to the heatsink by blobs of flexible silicone, and will be about 1cm off the heatsink.
This reduces vibrations and gives better air flow. i did it to my volcano II and it worked well.
<b>uraniborg
<font color=purple>"Brilliant thinkers have often met violent opposition from mediocre minds."