You better get the freon out soon before you lose it all, damn expensive stuff these days. Now about the shaft seal, yes it can be replaced, but I seldom do them. I did one a Buick a few weeks ago and the damn compressor failed right after. Seems it all wears together sometimes. Get a rebuilt compressor, evac the system and save that precious R12, replace all the o-rings since you have it empty, new accumulator, check and clean the expansion valve. Vac for leaks, pull vac for 45 mins or so and recharge.
Get ready to open the pocket book when these r12 systems start leaking things, repair and or conversion gets expensive fast. Its been a busy AC season for me, however profitable
