1997 GMC Sonoma Owner's Manual - Page 210

Engine Overheating You will find a coolant temperature gage on your vehicle's instrument panel. If Steam Is Coming FromYour Engine Steam from an overheated engine can burn you badly, evenif you just open the hood. Stay away from the engine you see or hear steam coming if from it. Just turn it off and get everyone away from the vehicle until it cools down. Waituntil there is no signof steam or coolant before you open thehood. If you keep driving when your engine is overheated, the liquids in it can catch You or fire. others could be badly burned. Stop your engine if it overheats, and get out the vehicle until the of engine is cool. I NOTICE: If your engine catches fire because keep you driving with no coolant, your vehicle can be badly damaged. Thecostly repairs would not be covered by your warranty. 5-12