You can do some pretty simple things to improve the comfort level of front seat passengers in campers 
First, seal up the fresh air intake for the ventilation system behind the grill if you are getting outside air into the ventilation system.
On 86+ campers, aim the bottom facing vents toward the rear cargo area to get cooler air into the AC intake.
Install a temporary headliner in the pop-top opening. I use a piece of cardboard 46"w x 36"l to fill the opening. When I open the roof, I push it up and put it on top of the upper bunk.
After doing the above modifications, I can comfortably cruise at 70 mph in +90F degree heat even with the sun beating down on the dash. My seat covers keep the air off the back of my neck and I can actually feel cool air on my face, chest and legs now.
Take advantage of whatever shade you can find to park in. You can leave your skylight open a small amount to let some of the heat escape while parked. 

Tim Hannink
Winter Park, Florida
Goldibox - 1987 Wolfsburg Edition Westfalia Camper
http://home.earthlink.net/~tjhannink/

  ----- Original Message ----- 
  From: KENWILFY@AOL.COM 
  To: vanagon@GERRY.VANAGON.COM 
  Sent: Tuesday, June 26, 2001 9:40 AM
  Subject: Re: AC hoses

  <SNIP>

  The A/C in campers is good for the people in the rear seat.  The folks in the 
  front wind up with a frozen back of the neck and a hot forehead, but unless 
  you want to fabricate some extra ductwork, this is the best you can hope for 
  in any vintage westie.  Hope this helps. 

  Thanks, 
  Ken Wilford 
  John 3:16 
  www.vanagain.com 
  Phone: (856)-765-1583 
  Fax: (856)-327-2242 

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