Power steering

For now your only concern is if the noise is too loud to hear the radio. There is probably still some air in the system. Little bubbles get compressed when the fluid is under pressure, and that makes them hard to be expelled. Each time you stop the engine, whatever air bubbles are in the reservoir will expand and work their way out.

Also, be aware larger pockets of trapped air can be down in the steering gear. You may need to turn the steering wheel fully to each side while one side of the car is higher than the other side. For most of us, that air works its way out over a few days. As it does, check the fluid level periodically. If it gets too low, thanks to the air being expelled, the pump might draw in more air and continue the problem.