I'm actually sitting on the side of the road while typing this; KJ started overheating, I'm letting it cool down so I can hopefully limp on home (not far away). Hoses are fine, serpentine belt is fine, no noise from the water pump (is there such a thing as a silent water pump failure?). Had the radiator flushed and filled last Saturday, but have driven several hundred miles since then without problem, and no, it's not unusually hot weather today. Any ideas of what to look for? 2004 KJ, 3.7.