My guess would be that with all the effort in designing and building the Bus they took everything into account. Looking closer it looks like the face itself might be an auxiliary radiator in itself and there are louvers all around. That and adding additional fans to draw air through controlled by temperature may be enough but I am no mechanic.
![[Image: Untitlbused.jpg]](https://i.postimg.cc/MMR6m0hb/Untitlbused.jpg)
![[Image: 7071.gif]](https://www.allsmileys.com/files/sweetim-texticons/7071.gif)