The gate keepers in the cooling system

So temp A is from the primary sensor near the thermostat. Temp B is from the sensor on the firewall near the heater core. Does A have anything to do with B?
I'm not aware of any relationship between the 2 temperatures.
 
Found one coolant temp sensor on the CX-3. It is at the bottom center of the radiator. Still looking for the other one and also the CCV.
 

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