Where is the low pressure connector to recharge air conditioner on a Chevy Lumina?

The low-pressure AC recharge port on a Chevy Lumina is typically located on the dryer/accumulator. This is a cylindrical component, often near the firewall on the passenger side, but its exact location can vary slightly depending on the year and model of your Lumina. It will have a smaller fitting than the high-pressure port.

Important Note: The fitting is usually capped, and will be a schrader valve similar to those found on tires. Look for a smaller, usually blue cap. However, you should not attempt to recharge your AC system without proper knowledge and equipment. Improper charging can damage your AC compressor and other components. It's best to have this done by a qualified mechanic.