1994 Buick Regal Owner's Manual - Page 191

The coolant level should be or above the at "COLD' mark. If it isn't, you may have a leak the radiator in hoses, heater hoses, radiator, water pump or somewhere else in the cooling system. If the coolant inside the coolant recovery tank is boiling, don't do anything else until it cools down. I NOTICE: I Engine damage from running your engine without coolant isn'tcoveredbyyourwarranty. I If there seems to be no leak, checkto see if the electric engine fan is running. the engine is overheating, the If fan should be running. it isn't, your vehicle needs If service.