2002 Buick LeSabre Owner's Manual - Page 258

There is one bleed valve. It is located on the thermostat housing. 4. After the engine cools, open the coolant air bleed valve. A. Clean the area around the engine oil fill tube and cap before removing. Twist the oil fill tube, with cap attached, counterclockwise and remove it. B. If you have the supercharged engine, remove the nut in the center of the cover shield. C. Lift the engine cover shield at the front, slide the catch tab out of the engine bracket and remove the cover shield. D. Put the oil fill tube, with cap attached, in the valve cover oil fill hole until you're ready to replace the cover shield. 5-17