There was nothing better at focusing your mind on how bad it was outside than driving a car with no heater. Brrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
A very good example Hondo
I have never had a car with no heater fitted but a few where they did not work or were virtually useless
VW beetle heat exchangers blown so you had a choice of engine fumes or freeze to death.