How fast is it?
The one I gotten was K6 233mhz
it was Medium Size ball bearing Fan
It would never come off, I even tried using screwdriver
but guess what happen?
The edges of it broke off, also I don't recommend
you freeze it might ruin the chips, or might not but wouldn't try it a risk to take.
My best suggestion would be to just leave it on cause it like
melted on the cpu you pretty much have to saw it
of course that is difficult too.