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I've always had cars with 'manual' controls for the heater, that is, levers that move the air flaps and water valve. So I keep the heater at COLD to help the engine warm up and that's always seemed to work.
My current car, a 2007 Mitsubishi, has the heater and A/C controlled by buttons and I am not at all sure there is a water valve. I think this is one where the coolant always flows and the heater simply diverts air over the core or not (and it does take a long time to warm up in the morning so I can't really tell if the heater position matters, and I think it doesn't).
But definitely, I've always had the heater as my last resort to combat overheating.
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