Arrived to SS2 water safety full of water, disconnected drain line at union and blew through drain line felt partial clog. Removed coil door to ensure nothing was blocking primary drain line, and checked refrigerant pressures to make sure the indoor coils weren’t freezing. Ran water and used co2 guns to clear drain line still felt partial clog. Cut drain line in half and blew through both ends with a water hose. Put drain line back together, blew through it no more clog, primed p-trap. System is cooling at this time.