Can anyone tell me where to find explanation of heat
and airflow for camper.

Purchased copy original manual expecting it to be in there
but only discusses fridge etc.

I know which lever is heat and which is defrost but exact
use of two fan switches, front doors vents open/close
purpose. Think its to help rear ventilation.

Rear vents and finally position of lever for under seat
heater to turn off and on.

GO