My compressor started to make this noise and I am not sure if it is the compressor or clutch. Pressure is nominal on high and low side. I brought it to a repair shop and they immediately said that I will need a new compressor - which means I need to flush, replace orifice, etc.
It blows cold air, I just refuse to use it because I picture metal shavings running through my system :(
It never starts making the noise immediately: it takes a few seconds. I turn off the A/C and the noise goes away when the compressor disengages. When I turn it back on the same noise will occur after a few seconds.
Take a look at the video and let me know what you think.