Here in CA you're in luck if you can get a can of Freon 12 for $30. In
my experience old cans are just as good as new cans. I've heard a lot
of horror stories about cans of R-12 that were actually something
else. Stick to name brands. DuPont has a facility in Mexico, R-12
there is about $6 per can, that's where I get mine.
My Bricklins usually take half a can every other year, as was normal
with my other cars. Most I've ever used on any car with a working
system was a can and a half. Never had a compressor off and lost a
charge that way so can't answer that.
Les
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