2003 Chevrolet Blazer Owner's Manual - Page 292
2003 Chevrolet Blazer Manual
Page 292 highlights
Heater and radiator hoses, and other engine parts, can be very hot. Don't touch them. If you do, you can be burned. is Don't run the engine if there a leak. If you run the engine, it could lose all coolant. That could cause an engine fire, and you could be burned. Get any leak fixed before you drive the vehicle. If there seems to be no leak, start the engine again. The engine cooling fan speed should increase when idle speed is doubled by pushing the accelerator pedal down. If it doesn't, your vehicle needs service. Turn off the engine. When the engine is cold, the coolant level should be at least up to the ADD mark. If it isn't, you may have a leak at the pressure cap or in the radiator hoses, heater hoses, radiator, water pump or somewhere else in the cooling system. Notice: Engine damage from running your engine without coolant isn't covered by your warranty. 5-29