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A/C Whistling Noise

  • 1995
  • 911 Carrera
Mileage: 
184 500
Heating and Ventilation
Houston, 
Texas

About a year ago, North Porshe Dealership checked and recharged my A/C in conjuction with replacing belts, etc.

They claimed that the compressor had a slow leak but I declined to have the repair done.

At this time, it starts to make a whistling noise about every minute or two (which it did before the dealership charged it up)..

I went to an off side autoshop to have the A/C pressures which showed nominial values (within 5 psi) on the high pressure side.

I had them chrage it up to max but it still makes that sound and not when the compressor turns on or off during driving (in this wonderful Houst summer humid heat)

Any ideas what would be causing this?

Thanks, Maurice

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