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Auto heating system

Heating and Ventilation

Vehicle Information: Model: 911 targa; Year: 1980; Body Type: Targa; Total Mileage: 77000;

I'm deep into the Automatic Heating system. What is the best resource for information on the control system? I have the Bentley book, but it doesn't show how to troubleshoot the contol module on between the seats. I hot wired the servo motor and it works just fine. Now what controls it?

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