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I can't imagine how a system sitting for 15 years is not just soaked in moisture. The "standard" rule of thumb for all ac systems starting over is to first replace the receiver dryer as a default.
With hoses that are that old, yea, good luck ever getting them to not leak like crazy.
Personally I would never use a propane or other flammable hydrocarbon based product, but that is me, and it is your car, do what you want to it.
It must be some magic stuff to not need a vacuum and clean system to work at all.
Good luck.
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Glen
49 Year member of the Porsche Club of America
1985 911 Carrera; 2017 Macan
1986 El Camino with Fuel Injected 350 Crate Engine
My Motto: I will never be too old to have a happy childhood!
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