Originally Posted by ps2cho

Spin VFC by hand; if it spins more than 1/3rd of a turn its done.
Reason? Fluid inside is super thick at room temp like honey is, so it SHOULD be tough to turn. If its easy and spins, fluid is no longer inside the clutch, or enough has leaked out its not engaging by itself.

My FC didn't work on 260E, did the check and sure enough it spun about 3/4 of a turn. New one goes about 1/5th.

Either way though, you should hear it roar as temps increase. They are reasonably loud when engaged.