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AC seals maintenance

>Stick with the freon unit.  The new "environmentally safe" stuff they 
>using is actually more harmful to the atmosphere and doesn't cool nearly 
>as well and freon.  My friends with new cars have pathetic air 
>conditioners.

True....I would like more info on why the R134a is more harmful than
Freon R12. New R134a systems in Japanese cars seem to work ok 
(from the  Corolla and GEO  Metro  I have rented  recently in LA)
There have been alot of  R134a BMW owners complaining though.


>Just remember to use the A/C all year round in order to keep the seals 
>from drying up and cracking, thus losing the freon.  It only has to run 
>a few minutes per week to keep it up and running.

Wait a minute....... nitrile / neoprene / nylon   O rings need nothing
but
a good interference fit in their fittings to seal. The part of the of
the 
O ring which is exposed to refrigerant/ lubricating oil is very small
and  the refrigerant/oil does not  contact the whole sealing surface of
the
O ring. The modern  AC seals are also " inert" to the refrigerant and 
lubricating oils. When the ac compressor crankshaft gets a wear groove
from the seal,the compressor will leak refrigerant.
The seals are so rugged that they actually cut grooves into the
crankshaft.
There is no preventative maintenance for this IMHO. 

Any illuminating factual arguments?

Sincerely,
Henri Baccouche