2001 Chevrolet Impala Owner's Manual - Page 267

If the coolant inside the coolant recovery tank is boiling, don't do anything else until it cools down. CAUTION: Heater and radiator hoses, and other engine parts, can be very hot. Don't touch them. If you do, you can be burned. Don't run the engine if there is 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. NOTICE: When the engine is cold, the coolant level should be at or above the COLD mark on the coolant recovery tank. To check the coolant level, look for the COLD mark on the side of the coolant recovery tank that faces the engine. Check to make sure that the coolant level is up to the COLD fill level on the side of the coolant recovery tank. 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. Engine damage from running your engine without coolant isn't covered by your warranty. See "Overheated Engine Protection Operating Mode" in the Index. 5-13