1997 GMC Sonoma Owner's Manual - Page 213

A CAUTION: Heater and radiatorhoses, and other engine parts, can be very Don't touch them.If'you hot. do, you can be burned. Don't run the engine there is a leak. If you run if the engine, it could all coolant. That could lose cause an engine fire, and could be burned. you Get any leak fixed before drive thevehicle. you The coolant level should be at the ADD mark. NOTICE: Engine damage from running your engine without coolant isn't covered your warranty. by If there seems to be no leak, start the engine again. See if the fan speed increases when idle speed is doubled by pushing the accelerator pedal down. If it doesn't, your vehicle needs service. Turn off the engine. If it isn't, you may have a leak in the radiator hoses, heater hoses, radiator, water pump or somewhere else in the cooling system. 5-15