1996 GMC Sonoma Owner's Manual - Page 197

Engine Overheating You will find a coolant temperature gage on your vehicle's instrument panel. If Steam Is Coming From Your Engine Steam from an overheated engine can burn you badly, even if 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. Wait until there is no sign of steam or coolant before opening the hood. If you keep driving when your engine is overheated, the liquids in can catch fire.You or it 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.