Problem with my 2006 Chevrolet Impala

Why does my 2006 impala power steering not work anymore. It is grinding and whining. I checked the fluid and it is low / empty. Where did the fluid go. Why does my impala loose fluid.
There are three types of power steering systems used on passenger vehicles. The first and most popular is known as power rack-and-pinion steering. It utilizes a power unit built directly into the rack assembly. When the wheel turns, an internal rotary valve directs the flow of power steering fluid to the proper end of the power cylinder. The difference in pressure on either side of this cylinder assists in moving the rack, thereby easing steering. A control valve then returns excess fluid to the main reservoir.
A common cause for loss of
power steering and the fluid is a power steering hose under the car. As viewed from underneath, on the v6 there is a small 4 in. hose that connects 2 pipes. It is at the intersection of the rt. (passenger side) frame rail, and the rear framerail. A new hose and clamps are needed. Then fill and bleed the system.
On the v8 models, the entire hose / pipe assembly must be replaced. This is quite a big job. The frame needs to be lowered and an engine mount removed. Then fill and bleed until the whining goes away.
Best way to bleed is to get the front wheels off the ground, fill the reservoir half way, turn the steering wheel to the rt. Then to the left- all the way to the stops. Do this 10-15 times. Check and adjust fluid level, then start the car.
Chevy Impala Leaking Power Steering Fluid

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