This may be too radical, but you could remove the tunnel.  Ours fell
down shortly after we got the factory recall notice and I just took the
whole thing off.
When I eventually got the AC working we found that it worked fine just
blowing from the rear; the cold air stream is somewhat diffused and
tempered and if you turn the fan up the air bounces off the visor
assembly and comes down onto you.  The best part is that we don't bang
our heads so much when sleeping, etc. in the back.
  You could take off the tunnel temporarily and try it that way; I
predict that you'll like it.

Larry A.

Mark C wrote:

>Has anyone come up with a way to put a roof vent or sunroof in a Carat that has air conditioning???
>
>I once saw a sunroof company that made these little mini sunroofs that could have been fitted on either side of the AC tunnel... but they stopped making these...
>
>For me the big thing would be able to leave it parked with the sunroofs open... to help it keep cooler (so heat can escape...)
>
>And... to use the same for sleeping in the van in florida in the summer...
>
>I went there once.. and it was so humid it was impossible entirely to even consider sleeping in the van at night... terrible experience... was forced to camp in a hotel...
>
>I dont if a dehumidifier would have helped... I have no idea how anyone with a VW Van can sleep in florida.... maybe thats why they such a rarity there...
>
>
>