So, as part of changing a leaking water pump, i broke down and ordered a new Behr radiator since the original looked too sorry to carry on much longer. I've since read up on de-oiling and the de-calcifying the system, and plan to use Cascade packets in distilled water, then flush a few times, then the MB Citric Acid stuff. (Sound good?) My real question is whether I should re-install the old radiator for this process, do all the flushing, then put in the new one? Seems like flushing the system with the new radiator in place might just deposit crud in a brand new radiator. It would be extra work for sure, but probably worth the effort?