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To me, the diagram shows water from the primary radiator cold side entering the auxiliary radiator, traveling across it to cool further, and discharging into the path to the hot side of the main radiator where it will help reduce the main radiator temp as it travels across to the cold side of the main radiator and is discharged again into the path for the hit side of the main radiator. Seems plausible to me for an auxiliary radiator.
The engine cooling system has a primary radiator and an auxiliary. The intercooler cooling system likewise has a primary radiator and an auxiliary radiator. That also makes sense to me.
I don’t see the ECU cooling lines in the diagram, but assume they are connected to the intercooler coolant system that runs at a lower temperature. The ECU lines look just like the lines going into the intercooler reservoir but I did not actually trace one all the way.
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