After some research and looking at the fan clutch I determined it was not serviceable. I've taken it apart to confirm this. The two aluminum halves are press fit together and internal pieces are rivited toether. There is no way to break it apart without damaging the fluid retention capability. There are no screws or bolts to service the item. The only failure mode I can see is the loss of fluid inside the clutch. This fluid could leak slowly through the pin behind the front cover plate or pass by the oil seals at thee base of the clutch housing. In addition to not performing as designed I imagine there would eventually be some mechanical failure caused by friction due to fluid loss of the silicon oil inside the clutch assembly. At some point I guess it would get noisy.
I'm enclosing some pictures of the insides. You will notice one of the clutch plates and the roller bearing and seals pressed into the rear of the housing.
