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I've seen the A/C videos and recently purchased a set of gauges that do not have a purge valve or the Schroeder valve in the hose. I've seen where they loosen the charge hose with the r134 can connected to bleed the air from that side but what happens with the air in the other 2 hoses? Does that not get sucked into the system?
The other question I have concerns the oil in the system. I watched where Paul used a cup full of oil, had the vacuum pump on the high side and used the low side to pull the oil into the system(A/C Leak Testing and Repair part 3 - 95 Jeep). Why does the oil not get evacuated out through the high side? This question really applies to anytime a vacuum pump is connected.
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