This might be the first time I take issue with something you say Rod, but here goes. The fan is there to increase the rate of heat loss/gain (depends on perspective) just like wind chill is related to "rate of heat loss" not actual temperature. Does it have an effect, yes if engine can't make heat as fast as it can be taken away temp will not rise and optimum operating conditions not met. So you are correct, but it still remains that a vehicle set over night is starting at ambient temp, not an artificial temperature that has been generated to guage relative comfort levels.
Did not look at John T's link, but we as humans don't really "feel" temperature. We feel rate of heat loss/gain, thus the concept of "wind chill" also the opposite measure of "heat index"
FWIW, wind chill does not take into account any evaporative processes since presumably we are not going to be perspiring when it is cold, but the heat index is almost entirely driven by evaporative cooling (or lack of it actually since as humidity rises it is harder to put more moisture into the air so no evaporative cooling)
My $0.02,
It is ~30 degF here is South Central PA and wind is blowing so not as bad as some of you, but feels cold to me today.
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