I am in the middle of renovating a house with a laundry list of problems, and I am in the process of removing the air handler and furnace in order to start working on some of the duct work.
I called my AC service techs to come out, check the system, and remove the coolant so that I could disassemble and pull the system out. When they arrived they checked the suction and liquid lines and said that the system was already empty, probably due to a leak, and I didn't need to worry about it if I was junking the system (it is 25+ years old, so yes). I was there and checked the gauges myself and indeed both were showing 0 pressure.
Today as I was removing the liquid line from the evaporator coil it was definitely pressurized, and managed to blow out a large amount of oil before I could get the line re-attached.
Could this be explained by some normal issue, or do I need to call company #2 to come out and evacuate the system?