Re: 69 AC/heater core question!
The Classic Auto Air system I'm installing uses an electric heater valve on a slide switch. I'm not sure I understand the logic of having the valve half-open. I don't see it making much of a difference if the heater coil is full of water (and if the valve is open at all, I assume it will fill pretty quickly).
That said, the valve that comes with the kit is quiet and can be managed electrically. I'm guessing something similar can be found as a stock replacement from some car.
69 Base V8 Coupe (purchased in 1988)
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