I have replaced my a/c hose (line), the compressor, the belt and recharged my a/c system. There is a nasty knocking or contact sound like something is hitting. The belt recently broke and it stopped blowing cold so we replaced most of the parts. Everything was brand new. No used parts. Any ideas on what could be causing this awful sound. Im afraid something is going to break.
Thanks Megan

Remove the same belt and run the engine. Is the noise still there?

I don't see compressor oil in the list, did you add compressor oil to the new compressor?