maz does your van have a/c?..
is the fan a viscous hub type fan at the moment..freewheeling type?
or is it a fixed fan...?

i tried thermos on the sinbox and they didnt cut the cake even with the 5 core radiator and ended up going back to a factory type arrangement with viscous hub and a factory type shroud..no probs at all last summer even sitting in traffic on a 38 degree day.

in saying this the injected van has twin au ford thermos but with a pwr alloy radiator and it stays super cool even when doing a 3 min burnout on a pad in summer.

well over 1000 bucks spent in keeping it cool but sinbox was only 250 for new viscous hub and a new shroud.