My 84 Westy (with AC) had the hot foot problem real bad. No way would you
want to drive bare footed! I removed some of the cardboard deflectors per
Bentley and put a layer of foil-backed insulation under the carpet. No more
hot foot.

For some reason my 90 (also with AC) does not have that problem, so I think
VW must have fixed it or the PO did the Bentley mod. However, the foam seal
on the air box is shot, so I have to tear into the dash at some point to fix
that. Not looking forward to that project. Meanwhile, I tried sealing up the
front air intake to block the hot air from coming in. It worked, but when
the AC was not needed it got awful stuffy inside and had to roll down the
windows often. Turns out it was not a very good solution, so I unplugged the
intake vent and will live with the hot air leak until I get in there to
re-foam the vent flap.

Cheers

Keith O