Originally Posted by Zacharias

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.