Etype heater box flap

Need someone to ride shotgun?

It’ll be on my trip to OK, with my wife, for her father’s internment service. Seats are are full up!

Re: heater box
A friend came over on Saturday with his new E type series ll he just purchased.
One of the first things I noticed is that the heat/air control levers were pushed in.
In is the on position, opposite rational thought? The bottom flap when closed directs air into cabin, when open, air is directed outside. Not a very positive seal, My car has A/C so I want to block off all airflow from the box. I seal off airflow at the screen on top with a piece of yoga mat that can be easily removed, just sits loosely on top.
Glenn