I have my oil cooler on the drivers side pillar, opposite where Tencent puts his. I installed a small acrylic air dam at the rear edge of the pillar air intake to increase air pressure over the intake and increase air flow to the cooler. It works well enough. 

For fans you can purchase high-CFM computer fans which do the job admirably. Newegg.com allows you to filter their search by CFM, and that's where I found some nice 220CFM models.  Two of them will give lots of air.  

Chris.

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Dnia Jun 15, 2011 o godz. 7:44 John Rodgers <inua@CHARTER.NET> napisał(a):

> This is an intriguing idea. If a shutter were installed with it to
> direct the air flow - one could direct the heated air outside through
> the floor, or inside to the interior of the vehicle if needed. It's not
> likely one would need the hot air coming into the van on a hot day anyway.
> 
> John
> 
> John Rodgers
> Clayartist and Moldmaker
> 88'GL VW Bus Driver
> Chelsea, AL
> Http://www.moldhaus.com
> 
> 
> On 6/14/2011 2:36 PM, Scott Daniel - Turbovans wrote:
>> it might be fun to use the rear heater as an addtional engine coolant cooler..