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The engine should have been power flushed and cleaned at the dealer, it is the only way to get the oil film out of the coolant pockets that will not drain. You paid a lot of money for some trainee to replace the radiator. It also sounds like there is an air pocket in the system.
In the gasoline engines, coolant is always flowing through the heater core. The amount of heat supplied to the cabin is just regulated by vent flaps. The coolant temp sensor is not effected by turning on/off the heat, except when the blower fan helps cool the heater core.
As for the ECT sensor and thermostat, the ECT should have been cleaned and the thermostat replaced.
Klaus
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Common sense trumps a PhD
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