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Intermittent Blower function

Heating and Ventilation

Model: 964 C4, Year:1989, Mileage:123000, Type of use:Both Street & Track
My blower fan turns when the car is started and runs at full speed for 3-4 seconds before shutting off on its' own and won't respond to any of the fan controls. During a drive, it will randomly come on for a few seconds and shut off again. I still appear to have control over the temperature, but I have no control over the fan.

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