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Even if the BSD is down or faulted, the water pump and temperature control will still work and be controlled by the computer via a default or failsafe strategy. The fact that your car over heated, even with a new pump would point toward an ongoing pump/cooling system problem. I would double check the pump is working via the purge procedure (easy to hear the pump and see the coolant stream into the overflow tank). Sounds like you know your way around the car, I include basic stuff to help others too. Thermostat working? Air lock? Keep at it and let us know when you figure it out.
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