I drove them old cold snow plows for 30 years way back when!! Most of them didn't have heaters either! --- One grader I used to drive didn't even have a back window. I tied a stovepipe to the manifold and some elbows up to the window. The engine fan did blow enough warn air up the pipe to keep from freezing! This stuff they use today almost drives itself! ---Bunch of wimps driving them.