thy this:
pump -> 'Y' fitting -> rads -> 'Y' fitting -> CPU -> GPU -> res / airtrap -> pump. make sure the res / airtrap is the highest point in the system.
what Brad was saying sounded like pump -> 'Y' fitting -> heater core goes to CPU, old rad goes to GPU, NB, and anything else on the system that you want to WC -> 'Y' fitting -> pump.
with that method, you keep the GPU and CPU on different loops.
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