I also discovered 308 cases with the ends cut off make great hose joiners in a pinch! Back to the intercooler and at this point I must apoligise for the photos above. Had a little trouble getting them to post and couldn't edit it after I discoverd my mistake so you get to look at Mt Ruapahu too, in my Photobucket... Basically the top heat exchanger is full of water, the electric pump pushes it through down to the radiator, which is quite large at exactly the same size as the inside of the alloy bash plate. Most of the time, running around town etc, you can leave the switch on the water pump off and the heat transfers through the water naturally. I only turn the pump on under sustained load, like climbing hills, towing etc when the boost is running at 11 lb constantly. The set up is more efficient at controlling heat from the turbo, the down side is that the lower radiator is somewhat clog-able if ya like diving into mud wallows.... for on road use its great.
P.S Re your '93...it's the first time that I have ever seen where 'rat damage' has saved someone a lot of money!