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A/C variable pitch humming/noise

Heating and Ventilation

Model: 996, Year:1999, Mileage:79,000, Type of use:Both Street & Track
Recently I've noticed an annoying whirring/humming noise from the area of the passenger footwell/dash that only occurs when the A/C is on. The noise is not from the blower, I checked that first by having the climate control on AUTO and then pushing the A/C button off.It seems to vary in pitch with the engine RPM as well.

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