Odor from HVAC vents on Volkswagen Passat

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: 63,911 (40,000–109,000)
8 model years affected: 2001, 2005, 2006, 2007, more2008, 2009, 2010, 2013
19 people reported this problem
10 people shared problem details
musty smell in cabin. Not fixed as yet
Bad odor from the vent every time I turn my car on
Musty smell when AC is turned on.
It's the "Beasts" not sure if anyone has seen that Seinfeld episode but that's what has been happening to my 2012 Passat. I love the car but the smell is terrible, we have spent over a $1,000 dollars with our dealer trying to flush it out. This apparently has been a problem with VW since 2009 why should I have to be paying for it. The problem only seems to be persistent in the warmer weather which indicates to me its something to do with the aircon. The dealer told me other then remove the upholstery thinking the smell has permeated into the interior, they don't know what to do. Thanks VW, I wonder what they will charge me for that. Does anyone have a solution to this "Beastly" smell.
This happens every spring. Tired of paying VW to do whatever "treatment" they have
Yes, I have a 2005 Passat, and have noticed over the past few weeks of a stale, musty smell coming through both dashboard and windscreen vents. It smells like air moving across damp insulation, and when the sunlight is in the car, the vapour is visible through the vents, plus it fogs up the inside of the windscreen.
stinky stinky car!! We've cleaned EVERYTHING inside, but the odor persists. We've flushed the hvac system four times, changed the interior filters, pulled up the carpet and cleaned weird moldy stains. Don't know what else to do!
Nasty smell for vents, mostly when using fresh air inlet. Not as bad when using AC with recirculation enabled.
Musty smell from a/c unit upon every use.
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