i recently went through a lot of 8 current chillers, 2 of them had bad fans. replacements are 50 bucks shipped from marine depot....
after looking at a chiller its clear thatit is nothing more than a window ac unit, with a box built around the evaporator that circulates water, instead of a fan blowing air across it.
id be willing to bet you could build achiller or a probe style chiller even from a pos window a/c unit and a some work
