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1988 911 Carrera Heater fan

Electrical and Electronic

Vehicle Information: Model: 911; Year: 1988; Body Type: Coupe; Engine (type, size, modifications): 3.2; Total Mileage: 155,000;

The heater fans, in each side of the interior footwells, run, at a very low speed, all of the time - even with the key turned off. The round switch, between the seats, that controls the speed works and by rotating it I can turn the fan speed up or down but never completely off. Thinking this switch was the problem, I tried disconnecting it(and also the switche associated with the levers because I think they are associated) but the fans still run. For the time being I have disconnected the power at each of the fans. Any ideas what else to do?

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