AC compressor noise

[Bullitt]

I replaced my ac compressor today because I thought my old one was going bad. I could hear it engaging/slipping from time to time. When ac was on. My new one does exactly the same. (This one was even making sparks, but I guess the plate in front of the clutch was a little bent. I bent it back a little and it seems fine now, except from the engaging/slipping noise) Any idea what does this?http://cloud.tapatalk.com/s/5da01878a9d6a/MOV_3577_000.mp4

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[Bitsyncmaster]

If your compressor is making noise, it probably is low on "oil". Usually a leaking refrigerant does not loose much oil in the system. When you replace a component or flush it you need to add that components "oil" amount to the system. The refrigerant carries the oil throughout the system so when your really low on refrigerant your compressor will not turn on to protect the compressor from damage.

[David T]

Go to N:10:04 Clutch Test Step 3-Air Gap. My guess is the gap needs to be adjusted.