Hi guys, I'm having issues identifying this high pitch noise, sounded almost like a kettle boiling whistle. I have changed all pulleys recently. The noise started to developed recently after a month right after I rebuilt my supercharger snout and changed all the pulleys as part of maintenance.

This whistle only occurs on Cold start and it gets loud at times during idle and quiets down by its own sometimes. I tried to blip the throttle to see if the noise increases but to no avail.. The noise gets away after driving for a couple of minutes. This whistling is getting worst now on cold starts / semi cold start.. To the point that I can't just ignore it any longer ��
Please help!
Link to video below.