Where is the AC low side service port on a 1993 Toyota Corolla?

On a 1993 Toyota Corolla, the AC low side service port is located on the passenger side of the engine compartment, near the firewall. It is a small port with a valve stem, and it is usually covered with a plastic cap to prevent dirt and debris from entering. To access the service port, you may need to remove the plastic cover and depress the valve stem.