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The noise you are hearing is the viscous fan, also known as a clutch fan. It has a silicon fluid in it which is controlled by a bi-metal spring on the front of the fan which opens a valve in the fan hub which lets the silicon fluid into a driving chamber causing the fan to turn making the...

Thanks guys, boy there is a wealth of info here, my brain is spinning after reading the ST-X 550 thread..good stuff. Sorry Scotty for using your nic I'll sign off as Scotty56 from now on. Scotty56

First post from me, I am looking at getting a new st-x 550 so I thought I would join and get some info. thanks Scotty