Where is the bleeder screw for a 1989 silverado/power steering

There is no bleeder screw, you will need to top of fluid then start engine turn wheel all the way right and left then shut off eng and check fluid level, top off again if needed, if you are getting a howling noise due to a repair to the system then it will go away after a little driving and air is purged from system, this is done automaticly. if theres still a noise then the pump will need to be replaced and some aftermarket pumps will make a small amount of noise but not alot. good day.

I'm not sure i understand what your asking exactly ...There is no bleeder on the power steering .
Just fill the reservoir on the pump and turn the wheels back and forth with the lid off and burp the air out and top it off as needed.