[KimMG]

All that stop leak you put into the cooling system may have clogged the radiator. Check the radiator for debri, bugs in the fins that would restrict airflow. You may have blown the headgasket between the combustion chamber and the coolant passage therefore no water in oil. Does your exhaust have a coolant smell? What are the condition of your radiator hoses? Old radiator hoses can collapse and restrict the flow of coolant.