You guys are far above my knowledge level and I truly appreciate the help. I was on the freeway in Vegas at about 60 mph when the temp went up. I don't recall an idiot light but the OD did shut down. I hit a downhill grade and the trans cooled down and OD came back on. The serpentine belt rubbed a hole in the AC hose which killed the AC a little before the temp went up, but I don't see how that would be related. I'll look for the check ball, plugged lines, check the harness, flow test and swap the trans filter this week or weekend and report back.