if you pressure tested free of leaks, vacuumed it out, and charged with the correct weight of R12, the coils are clean and new, the aux fan is running... it's doing all it can do.
the SDL has which compressor? sanden?

bubbles mean the liquid column of refrigerant is not solid. it's either low on refrigerant, or the ambient temp is above the design... (110°F certainly qualifies) what's the high pressure? what's the condenser liquid temp? I would do everything in my power to VERIFY zero outside air is mixing in.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!