Power Steering gurgle with engine off and turning wheels.

Just flushed the power steering system. Then the groan of my pump failing started so I replaced the pump flushed the system and am now trying to bleed out all of the air before starting the engine. With the engine off I cannot seem to get all of the air from the power steering rack to purge. I have the var on jacks ad haven’t started the engine yet to prevent further issues from the air. turning the wheels side to side I can hear a gurgle from the rack and pinion but it is not leaking any fluid. What or where would it be pulling air in from?