Where is the low pressure port on a 1989 toyota pickup?

On a 1989 Toyota Pickup, the low pressure port for the air conditioning system is typically located on the larger diameter aluminum line that runs from the evaporator to the compressor. It's usually found near the firewall on the passenger side of the engine bay. To identify it, look for a port with a cap that is often blue or black, which is designed for connecting the manifold gauge set. Always ensure the system is off and safely depressurized before attempting to access the port.