2004 Chevrolet Blazer Q&A

2004 Chevrolet Blazer Question: ac problems

when i turn on ac a loud noice, kinda sounds like something caught in fan. air works. a friend looked and no leaks but said there is no cover on front of compressor clutch. could this be the problem or cause of, what is the cover for? how do i no for sure what the problem is? three shops told me different things: clutch, compressor, fan. thank you! -
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