Where is the low pressure valve located for charging a 1988 Pontiac Sunbird Air Conditioner?

On a 1988 Pontiac Sunbird, the low-pressure AC service port (where you'd connect gauges to charge the system) is typically located on the dryer/accumulator. The dryer/accumulator is usually near the firewall, on the passenger side of the engine compartment. It's a cylindrical canister, often with a sight glass. The low-pressure port is usually smaller than the high-pressure port.

However, it's crucial to visually inspect your specific vehicle. The exact location can vary slightly depending on specific options and manufacturing variations. A diagram in your owner's manual (if you have one) or a repair manual specific to your year and model will be the most definitive resource. You can also find diagrams online using your vehicle's year, make, and model as search terms.

Caution: Working with refrigerant requires proper safety equipment and handling procedures. Improper handling of refrigerant can be dangerous. If you're not comfortable working with automotive AC systems, it's best to have a qualified mechanic perform the charging.