Thanks to all that helped. I guess I need to replace the worn out vents.
They have your common busted, unrepairable internals , missig louvers, etc.
I think both still have the foam seal around them, so I should be able to
close them off. The door vents are 1/2 and 1/2. Driver's side can be closed
passenger side has no slide mechanism or the piece that slides to close, it
is always open. I guess I will start looking for some. I am doing this for
heat, but want to seal it up nice to the outside before summer gets here.
Texas can be pretty hot and stress an AC unit quickly. So I want to do all I
can do to keep the outside, outside. Then I can stay cool on the inside. ;-)

Next step replace those interior lights and light switch so that i may see
again at night. Maybe while I am at it I will upgrade the exterior lights.

Thanks again,

Michael Knight
'77 Westy Deluxe, "el Verde"
'85 Vanagon GL, nameless