Check the evaporator drain for coolant, and pressure test the system
-- those plastic tanks have several failure modes that are not
obvious except that the cap won't seal. Test the cap, too.
Although it's cold outside, it's possible that you are getting
coolant "burping" into the expansion tank if the cap is bad, and if
the little hose to the trap tank under the fender is bad (as it
almost certainly is), you will pump coolant out of a bad cap.
If this is the case, it will boil over and run hotter than normal
when the weather warms up.
Peter
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