Bailes1992
Thread starter
Thanks for the confirmation!
I don't know much about Harry Potter, but way back in high school friend Tim had an old Anglia. It was slow to come up to temperature in the winter (and thus produce heat for the passenger compartment), so Tim's uncle fashioned a steel shroud which fit over the top of the engine.
Once the temperature gauge was up in the normal range and the heater was putting out good heat, Tim would pull over, pop the hood, remove the shroud, and stow it in the trunk.
Most of us were less handy - we would block off part of the radiator with cardboard instead.
I believe that the rear window never misted up on them due to the angle!