Depending upon the speed of the vehicle, it opens and closes an orifice controlling the flow of hydraulic fluid from the power steering pump. The power steering control module will store fault codes that will tell you what component is malfunctioning. The bumper extends beyond the radiator underneath and obstructs it. Don't want to pay to have it done. Also, I have a whine in the power steering which I hear is common among them.
Fluid is full.
The radiator drain is located on the bottom of the radiator. If you are unable to easily locate it, try removing the bottom radiator hose as a second way to drain the cooling system. What do I need to do to change the high pressure power steering hose.