hi Ray yeah so put in new coolant and water it's all coming back into the expansion tank, I squeezed the top pipe on the radiator and its fine not rock hard and as I squeeze it pushes the coolant t back into the tank so systems not airlocked. I also have a new radiator fitted aswell. I wonder is ot the coolant sensor as I'm looking on line I can see that there colour bands on them I wonder if I swap them for a different colour would that help?