Yes... in this configuration, you'll get some air trapped inside the radiator.... probably not much, but it will accumulate there since it's the highest point (I assume). Try making an air trap on the radiator's inlet... or better yet, drill a whole in the top of the case and attach a "T" fitting to the tube... with the "T" having the straight-through part point up, and the perpendicular branch pointing sideways going to the radiator. Have the other side of the T stick through the case and put a threaded male fitting with a cap... in this way, you will have an air trap.. but you will also have a convenient place to add water to the system.
I did this with my pupm enclosure, and I also saw Joe do it on his DH3 project... works really well!
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