I doubt they would loosen on their own. If you already lost the refrigerant, just unscrew and install new HBNR O-rings. Some from my HF kit fit. "just" wasn't easy. I had to use a long metric wrench (HF set) and secure the body w/ another long wrench. I replaced on my 1984 & 85, plus re-hosed the suction line in both, and changed all other O-rings.

If you still have refrigerant, the law requires you to have a certified shop recover it first. That said, when I was a teen one could buy a "BB machine gun" which used a can of R-12 (~$0.30 then) to shoot a stream of thousands of BB's. Then the O-zone Hole saga began, forcing the change to R-134A which is now being outlawed since a bad "climate change" gas. The EPA doesn't talk about the Ozone Hole today, other than "fixed it". Questionable, since most media stories of the time turned out to be wrong (deformed frogs in Costa Rica, ...). Let your conscience and understanding of science guide you, and beware of EPA drones watching.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans