2003 Chevrolet Astro Owner's Manual - Page 251

If there seems be no leak, to start the engine again. The engine cooling fan speed should increase when idle speed is doubled by pushing the accelerator pedal down. If it doesn't, your vehicle needs service. Turn off the engine. Nofice: Engine damage from running your engine without coolant isn't covered by your warranty. Notice: When adding coolant, it is important that you use only DEX-COOL@ (silicate-free) coolant. If coolant other than DEX-COOL@' is added to the system, premature engine, heater core or radiator corrosion may result. addition, the engine coolant In will require change sooner at 30,000miles (50 000 km) or 24 months, whichever occurs first. Damage caused by the use of coolant other than DEX-COOL@ not covered by your new vehicle is warranty. How to Add Coolant to the Coolant Recovery Tank If you haven't found a problem yet, but the coolant level isn't at the ADD mark, add a 50/50 of mixture clean drinkable wafer, and DEX-COOL@engine coolant at the coolant recovery tank. See Engine Coolant on page 5-28 for more information. Adding only p,n . water to your coG...rg system can be dangerous. Plainwater, 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 andDEX COOL@coolant. 5-34