2003 Chevrolet Astro Owner's Manual - Page 246

Notice: If you use an 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 coreand other parts. The vehicle must be on a level surface. When your engine is cold, the coolant level should be at ADD, or a little higher. When your engine is warm, the level should be up to FULL HOT, or a little higher. Adding Coolant If you need more coolant, add the proper DEX-COOL@ coolant mixtureat the coolant recovery tank. If you have to add coolant more than four times a year, have your dealer check your cooling system. Notice: If you use the proper coolant, you don't have to add extra inhibitors or additives which claim to improve the system. These can be harmful. Checking Coolant r Lvrl DEX-COOL@ L A A The engine coolant tank is located in the engine compartment on the passenger's side at the front. See Engine Compartment Overview on page5-14 for more information on location. Turning the radiato ressure cap when the engine and radiator are hot can allow steam and scalding liquids to blow out and burn you badly. With the coolant recovery tank, you will almost never have to add coolant at the radiator. Never turn the radiator pressure cap even a little -when the engine and radiator are hot. 5-29