Ric, consider yourself lucky that you don't have to deal with this! I've been here 10 yrs and went through these Polar Vortexs TWICE!! The above one lasted 3 days in a row and when it reached above 0 you could feel the difference. Let that sink in, going slightly above zero is a DIFFERENCE.
Doppler Mazda showed its temp at the gas station that morning. It was a little below 1/2 and I filled it up and getting back into the car my pants were frozen and it stung my legs. The defroster in my work van couldn't keep up at a light, crazy days!
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