As a Beetle, Microbus, and Corvair owner, I know all about driving in stupid cold w/o heat.
For my body, it's no big deal: being winter, I'm already dressed appropriately with hat, gloves, etc., although when it gets extreme I go old school (ever seen pics of people on horse drawn carriages in the winter?) and I use a lap blanket. That does wonders.
The big problem is window defrost/defog. I try to remember to leave the driver's door window cracked open ever so slightly so it doesn't freeze shut, and so I can open it a bit more for the first trip of the day and exhaust all that hot steamy breath of mine out the window. Sometimes I will only close the door latch to first click so the whole door vents better- but that one is for my vehicles that do have heat, I shut the door all the way when the heater starts blowng warm a few miles down the road. The VWs need windshield scraping outside and inside, so a small scraper is kept in reach. It's kind of a pain but it hasn't been so bad as to motivate me to rig up heaters/defrosters/whatever, except that I have put a propane sunflower heater between the front seats in a microbus before.
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