Gen 2 A/C compressor issue

Recently acquired a 2004 gen 2 with 220k on it. A/C hasn't worked in 2 years for sure. Recently attached gauges and found system at zero psi. Evacuated the system @30"Hg for 30 min suspecting a leak. Closed off the gauge valves and it held 30" for 1 hour. Maybe no leak ? While recharging with pure r143a, no additives, system got to 90psi both sides on approx 6 oz. Compressor cycles on for 5-6 seconds, makes a fairly loud buzzing sound, then off for 10 then back on about 4 more times but no drop in low pressure or increase in high pressure sides. A/C computer throwing 21 and 76 codes. Bad compressor vs bad expansion valve ?

 

Thanks, my thinking also but where did the r143a go ? Mystery. I have to find a scan tool and locate a gen 2 compressor and listen to it, I am a Prius newbie. I figure Winter isn't that far away !

 

Anybody know what the A/C compressor windings resistance should be ? I am thinking my noise is a locked rotor in the compressor as I am getting a err 76 which refers to compressor rotation load . I have been looking to see if there is a circuit breaker which would explain the 5 seconds on then off cycling.

 

Thanks for the info, it's been a while but It finally pulled the compressor and as all expected it was a total meltdown inside. See attached.

And this is my question is all of this rubble through out the system ? I picked up a used compressor and tested it, (don't ask how) pondering next step.