Thanks Ron. Just sitting pondering the revised illustration, I'm reminded that the matrix will tend to be hot all of the time. Probably not has hot as the block but it is a sort of passive radiator when the valve is shut. That does enable you have warm air as soon as you need it, especially for demisting. Heat will increase quickly once the block coolant starts to circulate through the matrix. With that in mind, those who live in hotter climes and never use the heater might prefer the in out hoses reversed so that the block coolant is shut off by the valve. This should lower the temp of the matrix and possibly reduce the interior temp by a degree or two. Probably not noticeable when running around with the windows open at 40º though. I think Cali has recently had some very welcome rain so demist might have been very useful now and then. Probably caught out a lot of people with worn/dried out wiper blades too but that's another subject. Rainex to the rescue.
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