this post was submitted on 11 Nov 2025
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Also, when it comes to mounting radiators, all that matters at the end is where the air collects, and as long as a vertically mounted radiator has one end above the pump, then air will naturally collect there. Tube orientation matters, but not a whole lot. Tubes on the bottom usually means that air collects on the side of the radiator where it's less likely to recirculate back into the pump, but mounting it the other way doesn't usually cause issues because the air can still collect and what few bubbles make it to the pump aren't significant enough to damage it.
TL;DR: the goal is to not run the pump dry, which should never happen as long as the pump isn't at the top of your water loop (radiator below pump).