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Matt Martin

You could.  That assumes you know the temperature – a water pump that is turned off will not flow water past an in-line temp sensor, especially if that sensor that is further downstream.  You could run the temp sensor directly off the engine’s outlet and have a better idea.

I think your application warrants a thermostat which opens the path for the radiator, but keeps a closed-loop (with the thermostat) when warming up.

45°C 3-Way Thermostat