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That would be great if we could simply do that. The problem arises when the thermostat closes and the coolant starts to boil because the manifold gets up to over 600F. Now you have a pressurized coolant loop and its gotta give somewhere. The 3rd gen Prius gets around this by diverting exhaust flow away from the heat exchanger. I'd rather not have to start hacking into the exhaust.
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