Learn how to recharge your KIA Optima Hybrid A/C system. Use R-1234yf refrigerant for model years 2013 or newer (not R-134a). Check your owner's manual for the correct refrigerant type. You can not mix different refrigerants. If you buy the wrong one, the adapters won't fit, which prevents you from recharging your A/C with the wrong refrigerant. Recharging should take less than 15 minutes. You can do this at home and you will be at your own risk. Caution: Engine parts may be hot. Always wear safety goggles and gloves.