[urq] a/c question

[Gary Brown]

Hey guys...
I had my a/c system checked out...new expansion valve, new reciever drier, new green o-rings and new gaskets and seals in the compressor. It held vacuum for 30+ minutes. Charged it with R-12 replacement to correct pressure. Turned on compressor. Fine, but no cold air. At anything above idle the compressor cycles rapidly, and i could watch as one of the gauges would go to 30, drop down to zero then back to 30 in tandem with the cycling. A/C tech says compressor is bad. Is there something else to check first?
Thanks
Gary