I don't know if the system was converted to 134 but it would fit the profile of the previous owner to have done the conversion. We have used the A/C alot over the last 4 months and I would say it blows about 40 degrees at the vent, if there was water in the system would it continue to perform in this manner?

BTW I changed the monovalve plunger/diaphram today because the heater was until now, a nonstarter.