Thermostat housing temp sensor

[saveevryjp1998]

I see both arguments on this. In easy words:

Southern states primary concern majority of year is heat.

Northern states yes and no. Balance is key. If you ran the cooler style setup year round where temperatures are commonly near 0 and below its not good. You don't want your e-fan running nonstop. It's just as harmful to run too cool. The factory setup was most likely done this way for a reason on a simple law of averages much like how a carberator was jetted for certain regions based on altitude maps.