I have found that Vaseline petoleum jelly smeared on the door seals works pretty well. Smear it on thin, just enough to coat the door seals, and your freeze-up problems should be over. If you do not have any Vaseline, you can use Armor-All (or whatever vinyl protectant you like) to coat the door seals. It does not last as long as the Vaseline, but it will work.
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