The impeller, from time to time referred to as a pump, is connected to and spins with the engine’s crankshaft. As the impeller spins, its blades capture fluid, and centrifugal power pushes the fluid to the outside with the impeller. So, you suspect your torque converter may be acting up. https://deanklifc.loginblogin.com/41314833/torque-converter-clutch-an-overview