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I rebuilt the box and this was attached to the heater/ac box. What does it do? I don't see where it's attached to anything other than the box. The car is a 67 Satellite factory air car.
From what I can remember that switch is used to bypass the heater valve bypass during max A/C or something like that. The factory service manual explains it's function in detail. If you want me to look it up when I get to the other shoot me a reminder PM on Monday please.