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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…

Last edited by LeMans850i

Here is something I saved on heater tubes and shutoff valves. There is another good reason to have the valves, if the heater core springs a leak its know to fog up the inside glass and windshield making impossible to see.

The drawback is you have to crawl underneath to turn them on and off… And what usually happens it just gets forgotten to do it frequently to make it work properly. that’s why I went to electric… I had those Home Depot shut off valves on my car when I bought it…

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