It depends on what type of car or truck you have. The heat box in some vehicles will crack, reducing the back-pressure necessary to push air all the way through the vents. Or it could be the fan in the system is dead.
Hard to say without knowing the model of car!
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.