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tcar,
That top left lever controls the mixture of cabin air to fresh (outside) air that is circulated through your cabin. All the way to the left is cabin air only. All the way to the right (half way on the panel) is all fresh air. The lever to the right controls the 3 speeds for the fresh air blower (Slow, medium and fast). If its in the middle position on the panel (full left portion of its travel), then the blower motor is in the off position.
You should have a separate rotorary switch in you center console to control the motor for you're A/C.
Hope this helps,
Matt
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'78 RoW 911SC Targa converted to a '86-like 3.2L Cab (w/930 body & No A/C) Custom subframe integrated into AutoPower Half Cage, Euro Ride Height, Turbo Tie-Rods, WeltMeister Bump Steer Kit, Sway-Away 26mm Rear Torsion Bars, Koni Adjustable Shocks and Strut Inserts, Two Bar Rennline Strut Tower Brace, Poly Motor Mounts, WEVO Trans Mounts, Modified Conical K&N Intake, ER PB A-arm bushings and 17" CUP3 Wheels. Steve Wong Chip!
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