Heater control valve position


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I remember a thread about this but can't locate it. Is the heater control valve supposed to be open while not on the car? I have an unknown, metal control valve that is open without vacuum.
I am doubting this as the heater flow would be continuous without vacuum source?
Which way are the turbo cars heater valves designed to operate?
That is what I was seeing with the unknown valve I have to install.
Thanks for the verification Anthony.