Originally Posted by Brad Allen
Here are the two most common types of AD heaters.
http://www.flickr.com/photos/advance-design_parts_co/8129448404/in/set-72157631868452754
The recirculating motor does not extend through the firewall, so it and the rectangle shaped hole in the passenger inner cowl are covered with steel plates. Here is the exterior one.
http://www.flickr.com/photos/advance-design_parts_co/8129182431/in/set-72157631867396207
Here is the interior one.
http://www.flickr.com/photos/advance-design_parts_co/8130538304/in/set-72157631870734114
Here are all the parts needed to install the Air-Flow this is a link to a series of NOS and originals.
http://www.flickr.com/photos/advance-design_parts_co/8129413707/in/set-72157631868452754

From your pics, I definately have a part like the one in NOS9, but I guess the DEF is worn off. It also looks like model of Air flow on NOS73.

I guess that I'll have to install a ronko (find one first), as well as the pull knob, as there isn't one on mine.

Thanks.

1953 3100

Melbourne, FL
Veteran