[cas3]

That is quite a story. I wonder if somehow some of the tubes got plugged? When people make radiators, Drake or whoever, they all buy the generic cores from only a few places that make them. They are cut to size, then the headers and tanks installed that make them vehicle specific. Certainly the manufacturer could not survive sell expensive things that don't work, so I suspect there is something wrong with yours. I also suspect Drake will tell you to take a hike. Good you got it figured out.