[EF You]

to test for clutch operation, you need to see that it spins freely. from there, ground the body of the compressor, and then jump the clutch wire (itll be up top and it runs between the compressor and the pulley.) if you hear it click, its moving, and if you turn the pulley and you can feel the compressor pumping through the high and low pressure holes (where you unbolted the two hoses). then the compressor functions. the only way to see if it leaks is by hooking it up and charging the A/C. if you disconnect the lines from it and lots of freon comes out, chances are it doesnt have any leaks.

hope this helped