It doesn\'t bubble out of overflow I didn\'t bleed it properly but this is what happened
1st run after doing water pump took it for a drive it was fine then started climbing and top rad hose popped off didn\'t do it tight enough.
2nd run topped water back up then went for drive and got hot and heater was blowing cold air. So I then bypassed core.
3rd run took for a drive then same as 1st run but bottom hose
4th run was fine until climbing and then rad cap started leaking with the pressure
And then I gave up too dark to carry on