Later versions of Chrysler Vehicles got rid of it. The air door in climate control box will direct all air away from the heater core if you move the slider all the way left to cool air.
BUT, the heater core, if coolant is running thru it, will heat up and its close to the AC evaporator and still in the climate box, so arguably its heating up the vent air and/or AC, even if its a tiny bit, just by being hot and near all those things. Thus they cut off the flow coolant and let the heater core cool off when not needed.
I guess in later years they improved the climate boxes enough that a hot heater core didn't effect anything.
Remember, there is a vacuum hose going to it, if you remove it, you need to plug the vacuum hose.