My 2.5-v6 suddenly started overheating a couple days ago. Water pump or Radiator

Thanks. The thermostat looked like new when I pulled it. No sign of any gunk. I understand that this kind of catastrophic failure is something these water pumps do. $400 to replace it. Yuk.

It could be the water pump that's true. If the water pump is working though, a blockage in the system is usually in the radiator or the heater core for the HVAC not the thermostat. Flow test would determine for sure.