2004 Buick Regal Owner's Manual - Page 246

4. After the engine cools, open the coolant air bleed valve. The bleed valve is located on the thermostat housing. 6. Rinse or wipe any spilled coolant from the engine and the compartment. 7. Replace the 3800 Series II V6 engine cover shield. 7.1. Remove the oil fill tube, with cap attached, from the valve cover. 7.2. Insert the catch tab on the cover shield under the bracket on the engine. 7.3. Place the hole in the cover shield over the hole in the valve cover. Install oil fill tube and cap by twisting clockwise. 7.4. If the vehicle has a supercharged engine, install the nut in the center of the cover shield. 5. Fill the radiator with the proper DEX-COOL® coolant mixture, up to the base of the filler neck. See Engine Coolant on page 5-26 for more information about the proper coolant mixture. If a stream of coolant is coming from an air bleed valve, close the valve. Otherwise, close the valve after the radiator is filled. 5-38