However, finding the exact location requires visual inspection. Look for a fitting with a valve that's usually colored blue (low-pressure) or red (high-pressure). Many people use a flashlight to help locate it. Referencing a repair manual for your specific 2002 Saturn L200 would be the most reliable way to pinpoint the exact location. You can often find these manuals online for purchase.
Important Note: While you can buy AC recharge kits, it's often best to have a professional recharge your AC system. Improper charging can damage the system and lead to expensive repairs. A professional can also identify leaks or other underlying issues.