intercooler is big chunk of aluminum mounted close to turbo..... the water to air one i have to play with weighs 2x as much as air to air...
air to air in open...
your is snuggled into the bay of a vanagon... it in its self is a heatsink... thiunk of the heat level you get out from under the cover after a spirited drive..
so yes i woul d100% think it will need to cool effectivily to cool its inner gas vs the surrounding air of the bay... but the bay will effect its overall temp too..
2nd thing to rember.. your only under boost at speed.. so the little fans only need to work in stopped traffic to help keep it to those temos.. cause if you honestly think that little fan will help at 65mph.. i cannot see it.. air flow will be much more then it can make..
id honestly think of it as its own cooling system... but with your set up to add a 2nd rad is easy..how the watercooled stuff helps most.. couple small rads easy to add in vs 1 big one..
and yes i know its a 2nd system.. i am trying to decide how to do the rad fan, water fan set up as this rad = ac condensor in size.. so fits the roddo rad like a ac condensor on a mk2 would.. all i gotta do is cut a nice hole in the core support for its cap.. and small overflow off to the side..
so me i have this front air mass to cool it.. but ok.. fan.. if rad one on i twill draw thru the cooler too.. but the fan will blow the hot air on the cooler too..
easy fix with a duct.. but no way the fan can do better cooling then direct air..
the rad will transfer heat to the cooler rad... much like ac does to coolent system..
cars with ac vs non ac.. load vs no load.. vs temps around town and on road.. that intercooler will be antifreeze temp at min on a hot day... so expect it to boil.. brass.. good bottles so on.. this kit i have came with a honda style cap... real pia to get on/off.. but that tells me to expect normal cooling system function.. just when really cool out i bet it runs alot better then a hot day..