Where do you add freeon in 03 pontiac gtp?

To add refrigerant (often referred to as Freon) to a 2003 Pontiac GTP, locate the low-pressure service port on the air conditioning system. This port is typically found on the larger diameter aluminum line running from the compressor. Remove the cap from the port, attach the refrigerant can's nozzle, and follow the instructions on the can to add refrigerant while the engine and AC are running. Always ensure proper safety measures and check for leaks after adding refrigerant.