In those you probably won't get below ambient temps, well maybe on the Al block and definately not on the rad. However in a bong cooler the water evaporates taking with it its latent heat of evaporation. This evaporation can still occur at or bellow ambient, (a block of ice still evaporates, very very slowly) dragging the temp down furthur. There comes a point where heat loss due to evaporation is equal to heat gain by conduction with air (this gain can only occur at temps below ambient) so that sets your limit for water temp.
If you already know this then disregard. However I did say bong cooler and phase change in my previous post.
Edward
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