Where do you put freon in on Hyundai elantra?

To add Freon (refrigerant) to a Hyundai Elantra, locate the low-pressure service port on the AC system, which is typically found on the larger diameter aluminum line between the compressor and the evaporator. Remove the cap from the port, then connect the refrigerant can's hose to it. Ensure the engine is running and the AC is set to maximum cool before adding the refrigerant according to the manufacturer's instructions. Always check for leaks and ensure proper levels to avoid damaging the system.