I need help if you please I flush coolant and i followed your steps I opened 1st and 2nd vents and after drop water i close them I did all and i start engine and when temp reach 90 while cap open alot of water goes out ... and temp down then i fill more and second time did it again ... fan working normal and radiator and upper hose still cold until last time i fill water and close cap temp reach 90 fan work and thermostat open and mix water from engine and radiator.... its work normally but why when cap was open water goes out and radiator cold ... Hope you could help me