Now look at the right hand image.
Surely the water will split at the junction above the cpu block, by an amount representative of the resistances of the two routes, having established that the small weak pump acts as an obstacle to flow.
Although Heatercores have low flow resistance compared to other radiators, they still have a good flow resistance.
As such, water will either flow the wrong way through the small pump or the flow will be very slow. Either way, this will most likley stall the smaller pump or cause it to fail, at which point you would have a lot of water flowing through the right hand circuit which will never go through the Heater core.
Does all of that make sense, or have I wasted my time.
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