1994 Cadillac Seville Owner's Manual - Page 279

If you use an improper coolant mix, your engine could overheat and be badly damaged. The repair cost wouldn't be covered by your warranty.Too much water in the mix can freeze and crack the engine, radiator, heater core and other parts. l I Adding Coolant Your cooling system when is under a lot of pressure. If the "ENGINE hot COOLANT LOW" message shouldappear on theDriver Information Center, you willneed to add coolant. If the "ENGINE COOLANT LOW" message does not appear, the coolant is at the proper fill level. 266