2003 Cadillac DeVille Owner's Manual - Page 296

Adding only pain water to your cooling system can be dangerous. Plain water, or some other liquid such as alcohol, can boil before the proper coolant mixture will. Your vehicle's coolant warning system is set for the proper coolant mixture. With plain water or the wrong mixture, your engine could get too hot but you wouldn't get the overheat warning. Your engine could catch fire and you or others could be burned. Use a 50/50 mixture of clean, drinkable water and DEX-COOL@coolant. Notice: If you usean improper coolant mixture, your engine could overheat and be badly damaged. The repair cost wouldn't be covered by your warranty. Too much water in the mixture can freeze and crack the engine, radiator, heater core and other parts. If you have to add coolant more than four times a year. have your dealer check your cooling system. The engine coolant surge tank is located toward the rear of the engine compartment on the passenger's side of the vehicle. For more information on location, see FnJnine Cn.mpafl.m~nt C)vpn.&!v e.? p?gs5-?2. . Notices If you use the proper coolant, you don't have i add extra inhibitors or additives which claim o to improve the system. These can be harmful. 5-25