Yeh it's an auto. I don't want to damage the auto cooler hoses by clamping them with mole grips though. I might get away with using some of the spare hose off my aquarium, to temporarily join the 2 ends together, as I think the diameter should be a good fit. I beleive the following steps are correct.
Remove the 2 electric fans from the radiator, make sure any wires are clear. Unbolt the radiator and slide it up and out after removing the hoses. Then get the hose pipe in there on full blast to flush the system through. Have I missed anything?