Odor from HVAC vents on Volkswagen Touareg TDI

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 a cleaner is available for the heater case. Also, the drain system should be checked for debris.

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Average mileage: 47,000 (24,000–104,000)
6 model years affected: 2005, 2006, 2007, 2008, more2009, 2010
10 people reported this problem
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problem details
2010 Volkswagen Touareg TDI 104,000 mi,
I am smelling a metallic odor coming from the AC. Have had a lot of rain lately and high humidity.
2010 Volkswagen Touareg TDI 25,000 mi,
Strong musty/mildew smell from vents when AC is first turned on.
2008 Volkswagen Touareg TDI 35,000 mi,
wet sock odor when hvac is started
Haven't found a way to fix this yet. But get a musty smell when I start the car.