It was the upper neck on the radiator. I took it out this morning and found it much easier then I expected. Four screws to remove the cover, disconnect the sensors, remove the hoses and 2 top clips and it slides out.
This is a higher milage car, im wonder how much trouble it would be to go farther into replacing the thermostat and the pump. The fan looks tricky to remove to get to the thermostat. and the pump might be even harder.