I have 2 1965 factory air cars. No heater water vacuum control valve was on either one. I did install one like J Schmitz shows, and it made no difference but did leak intermittently. I took it out when I was doing some other work in that area. Consistent 34-35 degree air from A/C ducts both with and without the valve on a r134a charge.
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"I know just enough to keep me here, but not enough to get me out"
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