Just have a general question about ac vacuum pumps. I tried to use one the other day for the first time, and couldn’t figure out how to get the pump itself to hold pressure.
- First I got a junky parts store rental pump and followed instructions to check oil.
- Block off suction port, let run and check oil level
- Slowly add oil as necessary
As soon as I turned it on, freon started blowing out of the oil pour cap, so i tightened it down and tried again. Same result. So I figure it’s just a shot pump and bring it back. They swap it out for a new in box unit and I bring it back and the same exact thing happens (but with just air this time.) Am I just having bad luck or is this normal?