Goodman 4-ton condensing unit, Goodman 5-ton evaporator.
My 5 year old evaporator was replaced earlier this week (don't use clorox), and they had to evacuate the entire system because the service valve on the high-side line was stripped out. After the evaporator was installed, they removed both line driers (one was installed inside the condenser by the mfgr) and replaced them with only one. A vacuum was drawn, and then the system was recharged with R22. I have limited experience with automotive A/C systems, but shouldn't some oil have been added if the entire system was evacuated? I asked the A/C tech that question and he said that the R-22 acts as a lubricant when it becomes a liquid, but that doesn't make sense. All I know is that they had a large green canister of R-22; I don't know if that has any mixed in or not. Thanks.