I know it probably sounds basic, but did you try to change the thermostatic
knob at the controls? Does it "click" to show that it's doing something?
I've got an 85 so that control may operate different than yours- but the
compressor on mine won't turn on if I have that knob turned all the way
"down"...

Dave

On Tuesday, September 6, 2016, John Rodgers <jrodgers113@gmail.com> wrote:

> 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
>