After some careful reading of these great responses, it comes to light that I have run the hose at the thermostat to the bottom outlet of the core, and the hose from the water pump to the top inlet to the core. Please carefully read this and comment, but what I plan to do is leave the cutoff valve in place at the thermostat, and run that hose to the top inlet at the core, and run the hose from the bottom outlet of the core to the water pump. Any comments appreciated.
