Retest your system or have apro do it. If you are losing coolant then it's got to be a head gasket/intakeleaking. It could also be your radiator as well. To check that let your car get hot and shutit off. Disconnect the electric fans and feel the radiator all over. If you feel any cold spots it's bad as it should be the same temp all over, not cold in one spot and warm in the other.