How did you bleed it? It can take some time for all the air to get out of a totally dry new pump and drained system.
To bleed, turn the steering wheel lock to lock with the engine running several times (and put some pressure on the steering wheel when you hit the locks to load the pump), and then leave the cap off of the pump with the engine off for at least an hour, or until the fluid is no longer milky, then repeat turning the steering wheel as described and check the fluid again. Repeat as many times as needed. As long as you dont have any leaks or problems in the rack, the pump should be fine.
The other issue is how the pulley gets installed, if the pulley is beat on with a hammer and not pressed on with a press or pulley installer tool, you will make dents in the vanes and pump walls inside the pump everytime you hit it with the hammer, and that will cause it to whine.
Autozone doesnt have the greatest parts, 2 bad pumps in a row is rare. It does happen though, I got 2 bad starters from them a few years back.
Last edited by Daytrepper; 05-03-2008 at 08:45 PM.