I suppose I could measure the pressure, to know for certain that head pressure bleeds down.

Is there any way to determine if fault is with clutch or compressor?

Thanks!

On 2011 1/2 ton dodge pickup with 3.7L V6. This happens when AC has not been running (no built up head pressure). Clutch attempts to engage, input shaft to compressor is turning slowly for a few seconds, squealing badly, then engagement happens, sometimes chirping happens after engagement, it seems ...