1. Consult your owner's manual: This is the best resource. It will show a diagram of your specific engine and the location of the PCV valve.
2. Look at a diagram online: Search online for "[Your Engine Code] Pontiac Bonneville PCV Valve Location". Replace "[Your Engine Code]" with the engine code found on a sticker under the hood (usually near the radiator support). This is crucial because different engines have different valve cover designs.
3. Visually inspect the valve cover: With the engine cool, carefully examine the valve cover. The PCV valve is usually a small, cylindrical valve with a hose attached to it. It might have a plastic cap or be directly visible.
Important Note: Before you start looking, make sure your engine is completely cool to avoid burns.