Where do you put the freon in at 2006 Chevy Cobalt?

To add freon to a 2006 Chevy Cobalt, locate the low-pressure service port, which is typically found on the larger of the two AC lines, usually near the engine compartment. Remove the cap from the low-pressure port, then attach the refrigerant canister with a recharge hose. Make sure the AC is running and set to the maximum cool setting before adding the freon, and follow the instructions on the refrigerant canister for proper charging. Always check for leaks and ensure the system is properly sealed.