2007 Buick LaCrosse Owner's Manual - Page 377

How to Add Coolant to the Cooling System (3.6L V6 Engine) Notice: Your engine has a specific cooling system drain and fill procedure. Failure to follow this procedure could cause your engine to overheat and be severely damaged. If your engine's cooling system needs to be drained and re-filled, please see your dealer. 1. You can remove the pressure cap when the cooling system, including the pressure cap and upper radiator hose is no longer hot. {CAUTION: You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol and it will burn if the engine parts are hot enough. Do not spill coolant on a hot engine. 3. Fill the cooling system with the proper DEX-COOL® coolant mixture, up to the base of the filler neck. See Engine Coolant on page 363 for more information about the proper coolant mixture. 4. Rinse or wipe any spilled coolant from the engine and the compartment. Turn the pressure cap slowly counterclockwise. If you hear a hiss, wait for that to stop. A hiss means that there is still some pressure left. 2. Then keep turning the pressure cap and remove it. 377