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That 4 position switch is for auto heat. It senses the heat inside the car and in the flapper box and automatically turns on heat. If it is broke it is cost prohibitive to repair it can easily be bypassed though. If you are having trouble with the dash controls do a search for heater controls or check a Bently manual it has a pretty good breakdown.
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Dean
1978 SC Targa Euro
1966 911 Coupe Restored/Burned/Sold - In that Order
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