Hi. I’m swapping a gen 4 JDM motor into a Gen 3 Prius. On the new motor, below the EGR, there are some new cooling bits. On the Gen 3 head there is a large radiator hose connection, then a cooling temp sensor, then a smaller radiator hose connection. On the Gen 4 head there is a large radiator hose connection, a temp sensor, BUT then 2 more electrical plugs? And I don’t see the smaller coolant port coming out of the head? Can anyone explain what I’m looking at on the new engine? IMG_9510 by Tbic posted Apr 1, 2026 at 1:10 PM IMG_9507 by Tbic posted Apr 1, 2026 at 1:09 PM
You might find some explanation in this video series, about 2/3 through: Swapping in a Gen 4 Prius' 2ZR Engine into the Prius v | PriusChat
