On 02/11/2018 02:58 PM, James Wilkinson Sword wrote:
My father's second car was a Citroen 2CV. You had to elect whether to
put a "muffler" over the front to make the engine warmer or colder
depending on the weather.

Big trucks often have those.

http://www.belmor.com/winterfronts.html

You used to see impromptu devices on cars but with most newer cars using
on-demand electric fans I haven't seen them lately.