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First and most important do this when engine is cool, should set 2to3 hours. and clean the head of the screw well before starting,you dont want any poss. contamanation. You should see some weepage around the seal, this is normal. Its just blow-by.There is a allen head bolt behind the pully shaft, you need to remove the cover(the one on top of the s/c that says seriesIIsupercharged) To check the fluid level you take that screw out,wipe it with a lint free rag! fluid level should touch the bottom of the threads in this hole. Use only OEM s/c fluid. GM part #12345982. Heres where things get tricky, Eaton the manufacture claims this to be a sealed maintance free s/c. But is it really? would you not change your engine oil just because it has synthetic oil in it? Thats what they seem to think. There are some people that have said GM put out a bulletin regarding this very issue. I have yet to conform this. They still say proper fluid level is all you need to do. I belive this is out of concearn for contamanation. I wont suggest anything, you need to decide for your selves weather you should change or not. I do once a year, but take caution to make sure that I clean every thing well first. The s/c cost about as much as the engine! What ever you do, Just be careful. There is no filter. and the black cap if i understand you right should be a nut that holds the pulley on. not sure what you are reffering to, but thats the only logical think that I could think you may be looking at.
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