There is probably a sensor somewhere in the engine compartment that has a
negative temperature coefficient thermistor in it. It's probably going
temporarily open circuit - high resistance equals low temperature. Tho if
you live in Yellowknife, that might be the actual temperature.
So, not sure of exact location but may be somewhere in front of radiator, on
a flying lead?. That is where it is on my car, a 96 S6.