why does my 2007 lincoln mkx keep blowing a/c clutch fuse

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my car made loud screeching noise and a/c stopped working.it has 140k miles. just from my past experiences I assumed it was a/c clutch.I got a used compressor,put it on,pulled vacuum,and tried to add freon, but comp would not kick on.It keeps blowing the a/c clutch fuse.I tried to track down a short but could not find one. I am not a mechanic, and have nothing against mechanics but I try to fix anything I can because I am retired and on a fixed budget. Any help would be GREATLY appreciated