Because its location can vary slightly depending on specific engine options and trim levels, it's best to:
1. Consult your owner's manual: This is the most reliable source for the exact location of your vehicle's power steering fluid reservoir.
2. Look for a diagram: Many online repair manuals (some are free, some are subscription-based) for the 1998 Pontiac Bonneville will have a diagram showing the location of all fluid reservoirs, including power steering.
Caution: Always check your fluid level when the engine is *off* and *cold*. When adding fluid, use only the type of power steering fluid specified in your owner's manual. Never overfill the reservoir.