I used to work for the Canadian equivalent of Consumers Union (Consumer Reports). We tested consumer hair dryers. We were alarmed at how easily some melt. The cheap plastic ones. They aren't made to run for extended periods, like the pro dryers.

I have done something similar in extreme cold on a previous car, using a small home space heater. But I only left it for an hour or so and kept one eye peeled for signs of trouble.

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22