if it is now you will have coolant just sitting in the heater core, might it hurt longevity of the core? I know a lot of cars have them, just raising the question.
Yes it is just a shut of valve
I installed a 5/8 ball valve in heater core supply hose. Made a bid difference, my feet no longer get hot.
Well my heater core I believe is original to the car, 67 Barracuda, nothing has killed it yet. The 50/50 coolant that is in there is new should not hurt it.
Probably a good idea to open the valve periodically.
