Where do you add freon to your 1999 Honda Accord air conditioner compressor?

The 1999 Honda Accord does not use freon. It uses R-134a refrigerant. There is a port on the low-pressure side of the air conditioning system where you add refrigerant. The port is located on the hose that connects the compressor to the condenser. It has a cap that you need to remove to add refrigerant.