Together with the three-passage torque converter, two passages are utilized for transmission oil (ATF) stream through the torque converter and for clutch cooling, when the third passage is used independently to control the lock and unlock with the clutch. Since it hits the turbine blades, the turbine starts off rotating. https://elliotbdcbx.answerblogs.com/34467935/the-smart-trick-of-torque-converter-clutch-that-no-one-is-discussing