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|The heater does add some cooling capacity when water if flowing through it. If the cooling system is working correctly, it should not be necessary.
My car has the same problem of hot air in the cockpit even though the vacuum-operated shut-off valve seems to be working correctly. I am not sure if the problem is water flow into the heater core or if there is just heat getting in through the fire wall. Maybe there is water leaking through the old valve even though it is "off". I am tempted to splice a manual shut-off valve into the line to the heater to see if that changes anything. This is going to happen later rather than sooner since there are still a lot of higher-priority things on my list.