2003 Pontiac Grand Prix Owner's Manual - Page 255

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@ extendedlife coolant. The following explains your cooling system and how to add coolant when it is low. If you have a problem with engine overheating or if you need to add coolant to your radiator, see Engine Overheating on page 5-33. Notice: When adding coolant,it is important that you use only DEX-COOL@ (silicate-free) coolant. If coolant other than DEX-COOL@ added to the is system, prematureengine, heatercore or radiator corrosion may result. In addition, the engine coola will require change soonerat 30,000 miles -(50,000 km) or24 months, whichever occurs first. Damage caused by the use coolant other than of DEX-COOL@ not covered by your new vehicle is warranty. What to Use Use a mixture of one-half clean, drinkable water and one-half DEX-COOL@ engine coolant which won't damage aluminum parts. If you use this coolant mixture, you don't need to add anything else. A 50/50 mixture of clean, drinkable water and DEX-COOL@engine coolant will: Give 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. 1 ---.-.gonly p n water toyourc 3 system can be dangerous. Plain water, or some other liquid suchas alcohol, can boil before the proper coolant mixture will. Your vehicle's coolant warning system is set the proper for CAUTION: (Continued) I 5-30