2003 Pontiac Bonneville Owner's Manual - Page 296

3. Remove the 3800 Series II V6 engine cover shield to access the bleed valve. 3.2. If you have the supercharged engine, remove the nut in the center of the cover shield. 3.3. Lift the engine cover shield at the front, slide the catch tab out of the engine bracket and remove the cover shield. 3.4. Put the oil fill tube, with cap attached, in the valve cover oil fill hole until you're ready to replace the cover shield. 4. After the engine cools, open the coolant air bleed valve. There is one bleed valve. It is located on the thermostat housing. 3.1. Clean the area around the engine oil fill tube and cap before removing. Twist the oil fill tube, with cap attached, counterclockwise and remnvc! it^ 5-37