2004 Pontiac Bonneville Owner's Manual - Page 305

Engine Overheating You will find a coolant temperature gage or a DIC warning message about a hot engine on your vehicle's instrument panel. See Engine Coolant Temperature Gage on page 3-47 and DIC Warnings and Messages on page 3-61. {CAUTION: Steam from an overheated engine can burn you badly, even if you just open the hood. Stay away from the engine if you see or hear steam coming from it. Just turn it off and get everyone away from the vehicle until it cools down. Wait until there is no sign of steam or coolant before you open the hood. If you keep driving when your engine is overheated, the liquids in it can catch fire. You or others could be badly burned. Stop your engine if it overheats, and get out of the vehicle until the engine is cool. Notice: If your engine catches fire because you keep driving with no coolant, your vehicle can be badly damaged. The costly repairs would not be covered by your warranty. If Steam Is Coming From Your Engine 5-29