Malibu? I have changed the water pump, thermostat, had the radiator rodded, bypassed the heater and it builds pressure. It is loosing water but not through exaughst or head gasket out of the over flow. When its hot I hear a clicking noise like maybe a one way valve or a pressure valve not letting is circulate. It just affoliates out of the over flow. I am stumped. Help me please.
