Where to add freon in 2006 Chevy silverado?

To add Freon to a 2006 Chevy Silverado, locate the low-pressure service port, which is typically found on the larger diameter A/C line, near the compressor. Remove the cap from the port and connect the A/C recharge kit to it. Make sure the engine is running and the A/C is set to the maximum cool setting while adding the Freon. Always check the vehicle’s specifications for the correct type and amount of refrigerant needed.