I had the system evacuated and charged last year with 134 by a shop who said I didnt need a new compressor or accumulator. He said the oil in the system for r12 is compatible with the 134. He said the evac. and the recharge with 134 and oil is typical. No parts need to be changed.
When I just now checked for low side pressure there is 0 and I tried to add a new 8 0z can of 134. The system would not accept any recharge. I ran the engine with ac on lowest setting. The system would not take any freon. The compressor was not running. Even with a leak and compressor not running should the system accept the recharge. thanks for all your comments!!!