Loud grinding noise when a/c is turned on. Just before this began I found a piece of black greasy hard plastic under the Nissan that was obviously broken. It was about half of a circular ring, maybe 4 inches in diameter. When looking at the passenger side of the engine with a flashlight I can see what looks like two wheels turning and rubbing against each other or something. I can also see metal filings or shavings.
You have a failed AC compressor clutch
http://ricksfreeautorepairadvice.com/car-ac-compressor-clutch/
SOURCE: how do you change rear wheel bearing on a 2004 nissan sentra
Yes it is as easy as it looks. If you had the tire off and figured out that it looks easy, you shouldn't have much problem.
SOURCE: 2003 nissan sentra scraping/rattling noise
Maybe its your engine mount that is loose. Try that and let me know if its that.
SOURCE: 2002 Nissan Sentra SeR AC not working
It could be low on refrigerant. They have a low pressure switch to keep it from coming on when it gets low to protect the compressor since no oil would be flowing to it.
SOURCE: I have a 2000 nissan sentra. When I make hard
No it is the propeller shaft which is making ,see if the dust preventing is not broken if so there is no grease in the shaft bearing,verify it.
SOURCE: metal on metal noise when in motion on front
could be worn out brake pad scrapping the rotor
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