Hello,
I have 84 vet (30K orig miles), had the AC (R12 freon) serviced in 1999, since then I have driven 3K miles and the A/C was not used for months.
When I had the A/C serviced, they replaced the hi & low sensor switch, removed the R12 / Oil, added Ester Oil and 3 lbs of R12 Freon.
Now...