Thanks for the advice, there's a number of good suggestions to explore here. The car is about 16 years old, and honestly we've already decided that we've taken it in for major repairs for the last time, and will likely get a new car in the spring. So if it does turn out to be the cracked core, I'll likely just suffer through it and hope this cold snap doesn't last too much longer. But I'll try rolling the windows down for a bit tonight and see what happens.
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