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It stands to reason that he is getting almost twice the normal EPA mileage, so the heat losses would be reduced by probably 50%.
At those ambient temps with hypermiling, he could probably cool the car with the heater core, considering the engine and all the coolant heater and radiator hoses, as well as the exhaust are all radiating heat to the atmosphere.
I would leave a small opening of some configuration for the electric cooling fan to draw some air through if it did come on with a full radiator block. At least some way to monitor if it did come on at all. Careful with a full block because it could block any airflow that the cooling fan would need if it engaged.
I also wonder if the thermostat is working properly. If he is reading temps at the thermostat area, it may be that the thermostat is not closing completely, at least as much as it is designed to close.
Nissan factory stats would fail open, and the engine would never warm up properly.
regards
Mech
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