Rod,
Thanks for your offer however I live on Teesside - a bit far away from Milton Keynes. Can you post details, make and so on?
RogerL,
Alas the Sedona has vents which which really are not up to the job. A previous car, a Volvo 740 - was ideal in this situation though found to be lacking when stuck in a traffic jam in the south of France during the summer of 2003. The best ever solution was opening quarter lights in the front windows (Austin A40) - the sort of thing found on cars which also came equipped with starting handles both tend to be missing on newer cars.
Lutz,
My intention when I do get a fan is to mount it on the floor between the front seats aimed at the roof. The downwash will keep both front passengers cool in the same way that a fan aimed at the 'van roof wafts down to cool both front bunks.
Thanks to all for your replies
Mike E