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Re: Vacuum switch on the A/C control
With the A/C on, the inside passenger vent door (recirculating air) should be open (vacuum applied) the cowl vent door (fresh air) should be closed (vacuum applied), and water valve closed (vacuum applied)
You will just have to use a trial and error method as to which switches do what. The above diagrams have all the info needed.
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1972 C/10 Cheyenne Super SWB. Restored, loaded, slammed.
1968 C/10 50th Anniversary LWB. Unrestored, stock, daily driver/work truck.
RIP ElJay
RIP 67ChevyRedneck
RIP Grumpy Old Man
RIP FleetsidePaul
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