Imo the only thing that your video shows is that your heater core is adding efficiency to your cooling system which is dropping the temps slightly. If your car does not stay at the temp of your thermostat your cooling system is lacking the proper efficiency in some fashion whether it be from airflow, water flow, or the size or efficiency of the radiator. The thermostat is nothing more than a bi-metal spring, it only knows temperature and opens and closes based on that.
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