AC systems don't just need recharging for no reason. They need recharging
because they leak.
Some systems with old seals need recharging every season or two. This was
fine when R12 was cheap, but it's not so fine any more.
Almost certainly if you have left the system for a season without a charge,
it will be time to change the dessicator.
Take it in to an auto AC service center and let them see if they can find
all the leaks.
"C'est un Nagra. C'est suisse, et tres, tres precis."
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