Does anyone know if this is coming from the A/C compressor or the idler pulley? It only happens when the A/C is turned on.

Short clip with audio: https://www.youtube.com/watch?v=ucJ_VhZuefY

At first when the A/C was turned on the A/C belt would move/turn slowly and make the loud sound. I removed the clutch and one of the small washer shims and now it turns at regular speed when the A/C is turned on though the loud sound is still there.

If it's on the A/C compressor is it one part I can replace? The belt is new and the idler pulley is fully extended.

Edited May 25, 20196 yr by userface
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It's either inside the compressor or it's the compressor clutch bearing. Either way - replace the compressor with a junk yard unit. 

GD

It turned out to be the Harmonic Balancer that needed to be replaced.