Has my ac been updated?

[Steeveedee]

Back in the days before all the controls were placed on refrigerant use, we were allowed to purge the system of air by performing a "sweep". This involved charging the system with a pound or so of refrigerant and then bleeding it off. The result was a reduction in air in the system simply because there was more refrigerant in the system. Back when you could get a can for 88¢ it might have made a little sense. I never did that, though. At the time, 88¢ was still quite a bit of money to me. I have a vacuum pump, anyway.