Would like to get ideas of what it maybe: bad thermostat? water pump replaced in 07 when changed belt, blocked radiator? don't want to keep driving it...don't want to seize the engine or blow head gaskets. or seals....any ideas on what it may be...going to try thermostat first. Coolant Temperature Sensor? where would that be located at?

 

Also check/replace radiator cap if it's not holding pressure can cause overheating