Clearing out Small Diameter Pipe
A combination of a solution of bleach water at the A/C end and a shop vac at the outlet may be useful. I had a similar clog in the drain with two elbows instead of sweeps (inside the slab) and the snake only goes so far. The snake helped open a bit of travel for the chlorine water, which takes some time to be effective, but the shop vac (wet/dry vac) really made the difference. If you duct tape the vac hose to the outlet end of the drain, you can be assured of maximum power, but even holding your hand around the end helps.