@with regards posted:I suppose if there is a valve that shuts off the heating completely, it may not matter? extra heating in the winter..
Unless you install shutoff valves in the engine compartment (which I installed as well for safety reasons) , the incoming pipe will heat up to the valve at the heater core located next to your gas pedal… this metal pipe is firmly connected to the tunnel in the center and it heats the tunnel up.., there is no air flowing.. just stagnant heat…
here in California, it does make a difference if your small cabin has an additional heat source…