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sour odor in ventilation system

Heating and Ventilation

Vehicle Information: Model : Cayenne S; Year: 2004; Mileage: 4200;

I purchased this vehicle at the end of November and now that it is beginning to get warm in upstate New York I am getting a sour smell from the vents. The odor is strongest when the air flow starts, but continues to be noticeable. My local dealer has ordered a new pollen filter to solve the problem. Since the tree pollen has not really started in my area I am a little suspect. Are you aware of this problem in other Cayennes?

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