Does anyone have the vacuum layout/schematic for the ac/heater controls? Obviously the AC/Heat switch is cable operated but the zone is vacuum correct? I have vacuum from the engine to the canister, from the canister to the line through the firewall but my heat only blows on the floor, it won't change zones. I'm sure I have a bad line somewhere but have no idea where all the lines are or where they run or run to. Any help s appreciated.
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