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Just a little point that I could be completely wrong on, but on most of the vehicles that I've worked on, there is no valve that controls whether or not coolant flows through the heater core. In fact the only way to by-pass a leaking heater core is to literally re-route the tubing.
Instead, its the air vents that change/move to determine whether or not you get "hot" air inside your car. So coolant is always flowing through the heater core whether you're on "blue" or "red". Its just that when its on "red" a vent opens that allows the air to be drawn over core and into the cabin.
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