Can’t you just set the car on fire to stay warm?
Yes. Be warm for the Rest of your Life.
You wrote that tongue-in-cheek, but it is sound advice to use the parts of the car to survive a blizzard.
When I was 12 years old, I read an article in Popular Science magazine (February 1963, page 88) that explained how to use your car to stay warm and survive cold. It's still good advice. I did a lot of work in very high altitude places and mountains ten years later and always kept the article's tips and suggestions in mind.
Here is the original article I read so long ago: How to Survive a Blizzard Using Your Car and Your Head.
Of course, you will probably have to find something else to hold the gasoline for your signal fire because "hub caps" are rare as hen's teeth these days. And you no longer disconnect the fuel line from the carburetor. But you get the idea.
Popular Science did a number of survival articles. Here's another with good tips from August 1966: How to Survive...Anywhere.