Im afraid its the compressor. Why i dont know since you did spin it. Is it a reman or chinese? is clutch charred from heat? Pull hoses on back and see if it will suck in a finger and hold the suction if so. If not, its bad sorry to say. I just put a reman on mine and i think its weak...not moving en...

HI. I got a 1987 Buick GN and had a compressor failure. I found very little silt /filings in system but flushed all components anyway. i run ES-12 with great success. So I put on a rebuilt compressor from Jensen Automotive. I ran a "smart orifice" from Rockauto. More on that garbage later....