Odor from HVAC ventson 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 : 76,285 (40,000–109,000)
8 Years Affected: 2001, 2005, 2006, 2007, 2008, 2009, 2010, 2013
15 people reported this problem
6 people shared problem details
musty smell in cabin. Not fixed as yet
1 person likes thisFlag inappropiate
Is cleaning the heater case something that has to be done by a Shop?
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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