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My advice would be to acquire a training manual for automotive A/C systems and try and educate yourself on at least the basics.
The info that you received about not evacuating the system (especially after sitting for 15 years) is baffling to say the least.
If the system has not been operating for 15 years I doubt that the frt condenser fan is working (which BTW is useless even when correctly functioning) and with no air flow across the rear condenser high side pressures can skyrocket pretty quickly. I don’t mean to come off as a negative Nelly and I wish I could give you some hope that you are heading in the right direction but it’s obvious you are not. Thank god that flammable Freon did not encounter a spark when the hose blew.
You are taking a 30 plus year old A/C system that really did not work that well when they where new that has been sitting dormant for 15 years and trying to just shoot some alternative Freon in W/O pulling a vacuum on the system or providing air flow across the condenser nor monitoring both high and low side pressures and expecting positive results is IMO wishful thinking.
I wish you luck in getting cold air from your vents especially in todays climate and as I said the best advice I can give is to educate yourself about the system before proceeding any further.
Richard
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