You may have to remove the P/S pump or some pulleys have a hole in then to access the bolt
Behind the strut support bar, behind and under the alternator is the power steering cap. It is difficult to get to. Good luck!
Where do you add power steering fluid on a 2003 Pontiac Bonneville?
behind the power steering unit on the oil pump housing above the oil filter
The power steering reservoir is underneath the alternator by the firewall.
The Pontiac Bonneville used the same power steering fluid from 1992 until 2005. You should look for GM Power Steering Fluid with part number1050017 for quart sizes or part number 1052884 for pint sizes.
This is two of the things I know that could be wrong. The power steering pump is either bad or there is no power steering fluid in the pump causing it to have steering problems. Be sure to check the fluid level in the power steering pump.
It is on the left side of the engine back by the firewall.
to remove pump on 1997 Bonneville, I aligned holes on actual pulley wheel access holes and reversed bolts.........
This is your power steering pump failing, I would suggest replacing it sooner rather than later.
Fill power steering resevoir Leave cap loose Turn wheel "lock to lock" 5-6 times
it is located behind the power steering pump. You need to remove the power steering pump to get to it which requires removing the engine mount next to it to get the bottom bolt out of the power steering pump. The sensor is directly behind the power steering pump. You can follow the cable that goes behind the pump. It is the only one there.
I found instuctions at autozone.com, and at my library in Chiltons in the reference section.