My brother & I typ get together for AC recharges, he has the vac pump to evac systems. I have a bunch of R12 put up. 14oz & 12oz cans, as well as 134A for our late models. I need to buy a vac pump. On a '68-72 A-bidy looking around 4lbs of R12. On original '60's & 70's AC equipped GM's, as well as in true restorations, I've found it best to stay with factory A6 or R4 compressor, brackets, evap core. Nice evap cores can be flushed & pressure tested. Lines can be replaced, always replace the dryer. The compressor set aside for my '72 T/A has been sealed up since the day I pulled it. High heat provision Frigidare replacement A6 off a phenomenally maintained '72 GrandVille. Am big on both function & factory appearance. Years ago, buying partscars, I'd occasionally get in a '69-72 A-body with the incorrectly bent (squared off) '68-72 POA tube, those cores would always make the alum scrap stack.
A good R-12 system should freeze one out in anything short of a dark vinyl interior t-topped 2nd Gen, or in an early Blazer. Both of the latter have been challenges in the hottest of OK summers.
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Buzzards gotta eat... same as worms.
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