Why would the power steering make noise even after fluid has been added?
In Car Starting Problems
Power steering noise When the fluid is low and you add some . it still needs more after you run it for awhile. The reason for that is that the pump pumps the fluid through the lines and gets out the air in them. Keep filling and checking after you start the car and turn the wheel from side to side all the way.
The bigger question is why do you need to add fluid?
After you locate and fix that leak, you can address the whine. If it is a Ford, it may be some what normal. It may be air trapped in the line.Or the pump may be damaged from running it dry, or there is blge in the line, starving the pump. Let's assume you have kept up on the maintenance and have flushed the fluid when it was dirty. Let's also assume that the pump is not damaged and you have found and fixed any leaks.
Try this:
Pull the fluid out of the reservior and add one bottle of Lucas brand power steering additive, and top with power steering fluid. I have found this stuff pretty good at resolving many power steering problems. if it's a ford it's because they use plastic parts in there casing's. most other car company's do the same. if that's not the case, then your pump is reciving too much stress from turning. try lubing up the chasis and changing the fluid completly. it wouldnt hurt to check your line's ether. sometime's blockage can cause too much stress on the pump too.
First thing is why are you adding fluid. If it has a leak then i would address that problem first. A pump will not bleed out if it is leaking. If every thing seems to be okay and your pump still whines. Then replace the pump. Note my advice is replace the pump with a new one from the dealer. These so called rebuilt pumps that you buy from places like autozone o'rielys etc.. Are cheaply rebuilt. Especialy if it's a ford. They don't bleed out right improper pump pressures. A good pump will bleed out almost imediatly.With the turn of the wheel a few times. If it doesn't then your pump will more than likely never completly bleed out. Buy a pump from the dealer it cost more but if your like me and don't like the noise then it's worth it.
You probably have air trapped in the system. Bleed the air out by revving the engine to about 1500-2000 rpms and turning the steering wheel almost all the way from one side to the other a few times. This should bleed out the air and take care of your problem.
If the noise is similar to that of a dry bearing, then the problem probably revolves around the power-steering pump itself. If the noise you hear has a "click, click, click" to it when making turns in your vehicle, then the problem is more-than-likely your CV joints. If the noise is screeching, check your belt for wear-and-tear and proper tension.