Odor From HVAC Vents on Volkswagen R32

Condensation may develop in the heater case which can cause a musty odor from the heating, ventilation and AC (HVAC) system.  Our technicians tell us the drain system should be checked for debris. In addition, a cleaner is available for the heater case.

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Average mileage: 21,000 (18,000–24,000)
2 model years affected: 2004, 2008
5 people reported this problem
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problem details
2008 Volkswagen R32 18,000 mi,
Sour odor, like cheese, DISGUSTING whenever air was on. Worse when a/c was turned on. No Solution yet.
2008 Volkswagen R32 24,000 mi,
A musty aroma was evident any time the AC was turned on. The dealer applied a Aircomatic treatment and it appears to have corrected the issue. I suspect that this is something that will have to be done yearly. Obviously not a very good design on VW's part.