2003 Chevrolet Astro Owner's Manual - Page 264
2003 Chevrolet Astro Manual
Page 264 highlights
Vehicle Storage If you're not going to drive your vehicle for 25 days or more, remove the black, negative (-) cable from the battery. This will help keep your battery from running down. Jump Starting If your battery has run down, you may want to use another vehicle and some jumper cables to start your vehicle. But please follow the numbered steps to do it safely. Batteries have acid that can burn you and gas that can explode. You can be badly hurt if you aren't careful. See "Jump Starting" next for Batteries can hurt you. They can be dangerous They contain acid that can burn you. They contain gas that can explode 0 They contain enough electricity to Contact your dealer to learn how to prepare your vehicle for longer storage periods. Also, for your audio system, see Theft-Deterrent Feature on page 3-47. Nofice: Ignoring these steps could result in costly damage to your vehicle that wouldn't be covered by your warranty. Trying to start your vehicle by pushing or pullingit won't work, and it could damage your vehicle. 5-47