Need to trouble shoot this AC system and don't know quite where to begin.
Suggestions would be appreciated.

History: AC system  was not operational for 15 plus years. Surprisingly,
when the mechanic went to flush it, it still had R12 pressure in it. He
evacuated it, flushed the system - man oh man at the crud that came out.
Installed a new receiver/drier, new receiver/drier seals, and new "O"-rings
at the compressor. The clutch free-wheeled so the hope was that it would
work. No such luck.

Whats been done:  new receiver/drier with "O" rings, new "O"-rings at the
compressor, evacuated the system down to  minus 29 inches Hg. Added 3 oz.
of PAG 46. Added 12 oz. of difluoroethane 152a. ( should have been enough
to kick on the compressor but no joy!)( One can kicked it on  in my '88 GL)

Troubles: With engine off, ignition on but not in start mode, Fan didn't
kick on when the AC switch was turned on.
Compressor clutch did not engage.

Inoperative:
AC condenser fan
AC evaporator blower
Compressor clutch
Compressor?

Where to start? This thing has a lot of pieces.

Thanks,

John