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Originally Posted by greggyc
I can turn it by hand without any hard resistance...is that good or bad?
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We are discussing the A/C compressor . . . I have always read the first thing to check is belt tension. There is a tensioner at the front of the engine slightly to the left (driver's side). You mentioned some black debris? Does it happen to be belt particles? Do you see any cracks or other signs of belt wear? If not, you could loosen the upper through bolt on the belt tensioner. The bolt head should be at the back and the nut at the front. It passes through a portion of the aluminum head casting. At the right side of the belt tensioner (left as viewed looking into the engine compartment from the front of the vehicle) is a hole that you use to apply some tension on the tensioner as you loosen the bolt. I typically use one of my 3/8" drive extensions in the hole to put enough pressure to relieve the tension on the bolt. Once loosened, work the tensioner some with the 3/8" extension. Hold pressure and retighten the bolt. Snug is good . . . if the belt is worn to a point that it needs replacement, this is the same procedure you will use. If in doubt, replace the belt.
There are many members that have much more experience with these. I have attempted to touch on the simple items.