2003 Cadillac DeVille Owner's Manual - Page 295

Engine Coolant The cooling system in your vehicle is filled with DEX-COOL@ engine coolant. This coolant is designed to remain in your vehicle for 5 years or 150,000 miles (240 000 km), whichever occurs first, if you add only DEX-COOL@ extended life coolant. The following explains your cooling system and how to add coolant when it is low. If you have a problem with engine overheating, see Engine Overheating on page 5-27. Noficer When adding coolant, it is important that you use onlyDEX-COOL@(silicate-free) coolant. If coolant other than DEX-COOL@ added to is the system, premature engine, heater core or radiator corrosion may result. addition, the engine In -coolant will require change soonerat 30,000 miles (50,000 km) or 24 months, whichever occurs first. Damage caused by the useof coolant other than DEX-COOL@is not covered by yournew vehicle warranty. A 50/50 mixture of clean, drinkable water and DEX-COOL@ coolant will: Giving freezing protection down to -34" F -37" C. Give boiling protection up to 265" F (129" C). Protect against rust and corrosion. Help keep the proper engine temperature. Let the warning lights and gages work as they should. What to Use Use a mixture of one-half clean, drinkable water and one-half DEX-COOL@ coolant which won't damage aluminum parts. If you use this coolant mixture, you don't need to add anything else. 5-24