1994 Cadillac Seville Owner's Manual - Page 239

I Engine damage from running your engine without coolant isn't covered by your warranty. If there seems to be no leak, checkto seeif the electric engine fans are running. If the engine is overheating, both fans should be running. If they aren't, your vehicleneeds service. How to Add Coolant to the Coolant Surge Tank If you haven'tfound a problem yet, the coolant level isn't visible but inside the surge tank add a 50/50 mixture of clean water (preferably distilled) and a proper antifreeze at thecoolant surge tank, but be sure the cooling system, including coolant surge tank pressure cap, is cool the before you do it. (See "Engine Coolant" in the Index for more information about the proper coolant mix.) If it isn't, you may have a leak in the radiator fiose, heater hoses, radiator, water pump or somewhere else in the cooling system. 225