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So when you turn off the air con the noise stops ..
If yes then its the bearings in the Air Con pump which is driven by the same belt and when turning the r13 coolant around the bearings being dry and worn out will start to make the noise Same as the water pump does when it goes, but yours is Air Con Pump.
DONT TAKE IT OFF YOUR SELF. RON
If the air compressor is bad... check the diagram under the hood for the serpentine belt. Most vehicles will have a diagram that displays the serpentine belt path along with a part number for a shorter belt to bypass the ac compressor. If you can't find the diagram, go to your local parts store and they should be able to help.