Where to put freon in 2004 buick rendezvous?

To add Freon to a 2004 Buick Rendezvous, first locate the low-pressure service port on the air conditioning system, which is usually found on the larger diameter aluminum line between the compressor and the evaporator. Remove the cap from the port, attach the refrigerant canister with a recharge hose, and open the valve on the canister to allow the Freon to flow into the system. Ensure the vehicle is running and the AC is set to the maximum cool setting while adding the refrigerant. Always check the manufacturer's specifications for the correct type and amount of refrigerant required.