1999 Saturn SL1 Losing coolant rather quickly

I have 1999 Saturn SL1 that has been losing coolant rapidly however none comes up when I check under the car. It has a new radiator, new hoses, new thermostat, as well as a new antifreeze cap. The heat works fine and the car drives fine but after a little while the effects of low coolant cause slight overheating and loss of heat. What could be causing the coolant light to go off as leak this much? Also, my car has the check engine light on for over twenty codes relating to air flow and the sensor. Idk if that is related, but any help would be appreciated.