No, you generally do *not* have to remove the power steering pump to replace the water pump on a 1996 Pontiac Bonneville 3800. While they are in close proximity, with careful maneuvering and the right tools, you can usually access and replace the water pump without disturbing the power steering pump. However, it might make the job *easier* to remove the power steering pump on some people's setups depending on their comfort level and access to tools. Many mechanics will choose to leave it in place for speed and efficiency, though.
Consult a repair manual specific to your vehicle year and model. The manual will provide detailed instructions and diagrams, showing the best approach for your specific situation. These manuals often show alternate approaches, allowing you to choose what's easiest for you.
