To bleed the system.
1. Fill with atf to cold line.
2. Start engine.
3. Rotate stearing wheel lock to lock 10 to15 times. Do this slowly and do not hold at end of lock.
4. Check atf in tank. Fill to hot mark.
5. Repeat until fluid level stabilizes.
Now there will be bubbles in the fluid. This is where the car has to sit for the foam to dissipate. This is gonna take some time, so be patient.