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1985 911 Carrera Manual Heating System

Heating and Ventilation

Vehicle Information: Model: 911; Year: 1985; Body Type: Targa; Engine (type, size, modifications): 3.2; Total Mileage: 122000;

I've recently acquired this car and I'm in the process offixing/replacing some neglected components. After replacing some brokenhoses to my foot well blowers, I realized that neither fan was coming onwhen I engaged the switch between the seats. It turns out that thepassenger side fan is bad (12v directly didn't spin it), but the driver'sside is good and it doesn't work either. Also, the engine compartment fanturns all the time, even when my control levers are full down. Bothlevers engage the switch contacts under the shroud. All fuses are goodand relays in the luggage compartment are good. My last attempt will beto replace the Heater Control Relay in the engine compartment, but it'snot cheap so I was hoping for a diagnostic.1. Does this seem like the culprit?2. Is there a way to test without black-box debugging?

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