Where is the AC recharge port on a 1999 Chevy Lumina?

The AC recharge port on a 1999 Chevy Lumina is typically located low on the engine compartment, near the compressor. It's usually a low-side port (for adding refrigerant) and may be a larger fitting than other ports nearby. It will likely be a Schrader valve, similar to a tire valve, though it might have a protective cap.

However, precise location varies slightly depending on the engine and specific trim level. You'll have better luck finding it by:

* Consulting your owner's manual: This is the best resource. The manual should show a diagram of the engine compartment.

* Looking for a low-pressure port near the AC compressor: The compressor is a large component often near the front of the engine. The low-pressure port is usually the larger one of any two ports you find.

* Using a diagram specific to your Lumina's engine: Searching online for "[Your Lumina's Engine] AC System Diagram" will show you a picture that can help. For example, if your Lumina has a 3.1L V6 engine, you'd search "3.1L V6 Chevy Lumina AC System Diagram".

Important Note: Recharging your AC system yourself can be dangerous if not done properly. Refrigerant is under high pressure and can cause serious injury. If you're not experienced with automotive AC systems, it's best to take your vehicle to a qualified mechanic.