Originally posted by 87442lover
He got it kind of right, clutch fans will ALWAYS be turning with the engine. It's just that when the temp gets high, the clutch tighens a bit and it spins closer to the water pumps RPM. Even a bad clutch fan will spin. And yes you need a shroud.
Someone told me there are 2 types of clutch fans, thermal and centrifical. By looking at mine how can I tell which one I have ?