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My car makes a buzzing or whining like noise from the front when the AC is on. This happens even when the temperature is set so there is hot air coming out of the vents. Porsche runs the AC to dry the air being circulated in the car even when heating.
Try this to see if the noise is AC related. With the engine on and the AC snowflake showing on the LCD display, listen for the noise. If you hear it, push the snowflake button on center console so that it the snowflake disappears on the LCD display. If the noise goes away, then it's AC related. Most likely, it is coming from the expansion value of the evaporator. One is cheap to fix. The other is costly.
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