You Should have an evacuation system. Many people working on cars just vent it, similar to what happens in every semi serious car accident where the front ac co

You Should have an evacuation system. Many people working on cars just vent it, similar to what happens in every semi serious car accident where the front ac condenser is damaged. Or what happens in most 15 year old systems that simply vent to the atmosphere from leaking seals and require a fillup. Not ideal, but a diy usually just goes for it. You might want certification to stay alive, but again, tons of diys are making due on Chevy volts.