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.
It is on the left side of the engine back by the firewall.
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.
Behind the strut support bar, behind and under the alternator is the power steering cap. It is difficult to get to. Good luck!
eny power steering fluid will work
take off serpentine belt unbolt powersteering pump and hoses and drain it. That's it.
DOT 3 power steering fluid.
There is no power steering fluid on Pontiac G5/Cobalts, as they are assisted by an electric motor-as opposed to the conventional hydraulic system.
Probably at the power steering pump. You will find that at the side of the engine that has your drive belts, most likely at the passenger's side and toward the back and top of the engine.
Put it in the p/s resirvoir located on the pass side of the engine compartment under the alternator.
At or near the power steering pump.