Otmar, could be that the air entering the engine compartment through the side vents
flowed out around the engine instead of through the radiator.  This might have been
the path of least resistance.  Did you cut out part of the lid and fit the radiator
into the lid?  Maybe a radiator that offered lower resistance to air flow would have
worked better.
-Dana-

Otmar Ebenhoech wrote:

> I tried a radiator in the rear deck lid. (stretch 72/73 bus with a ford
> V6). Standing on the bumper at 60 mph (tied in with a harness) I found
> there was minimal airflow through the deck lid area with no fans
> assistance. If you put the radiator in the deck lid plan on a good size
> engine driven fan. I found that a 13" engine driven flex fan plus 2
> electrics on a 4 core custom radiator was not enough to cool the V6.
>
> I ended up with the radiator on the roof. If I did it again I would put it
> on top of the front bumper as it is in one of the pictures in KEPs catalog.
>
>  -Otmar-
> 82/86 Stretch Vanagon Westfalia Syncro GTI. "Power of two"
> http://www.evcl.com/strvan/strvan.html
> Several EVs (Electric Vehicles)
> Electric Vehicle Components Ltd. (650) 494-9255