Important Note: It's crucial to visually confirm the location and not just rely on a general description. The exact location can vary slightly depending on the specific trim level and any aftermarket modifications. Look for a service port with a cap (usually blue for low-pressure).
Recommendation: It's strongly recommended to consult a repair manual specific to your 2000 Chevy Venture or to take it to a qualified automotive technician for AC recharge. Improperly handling refrigerants can be dangerous. They are under high pressure and can cause serious injury.