I need info on charging an A/C system with a York compressor. I read where it needs 12 oz of oil. I think in the compressor. But does it also need oil in the lines? I have a York mounted on the 4BT in my Blazer. I saw no reason for it not to work just fine, but do you know of any potential issues? What cycles the compressor on a regular 78 chevy truck system? Is there a thermostat inside the evaporator box? Asking now to ake sure.