No, however, when the problem cropped again after the radiator was replaced, the lower hose was stone cold after driving 30 miles. I replaced the thermostat at work that day, and the lower hose was still cold after driving it home from work that night. After the water pump, and rad cap replacement, the lower hose now feels very close to the same temp as the upper one.

The first time that this cropped up, we found the radiator clogged. Problem went away completely for a while. Then it came back during a drive to work. The T-stat did not solve that problem, and I had to be very careful getting home. The water pump, coolant flush, and rad cap replacement solved the problem for a while again. The coolant level has not changed, and has not picked up any new soot or oil.