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auxiliary heater switch?

Heating and Ventilation

Vehicle Information: Model: 911 Carrera ; Year: 1987; Body Type: Coupe; Engine (type, size, modifications): 3.2 liter; Total Mileage: 54,000;

The three-position auxiliary heater blower switch between the seats only functions in one of the three positions. I have replaced it with a salvaged switch, and observe the same phenomenon. Other than a defective switch, what other cause might there be?

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