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.Google+
Car Problem Reports
Volkswagen Passat Odor from HVAC vents
Volkswagen Passat Problem
Average Mileage: 69,200 mi (40,000 mi - 109,000 mi)
Visitor, 2009 Volkswagen Passat, 42,000 mi
musty smell in cabin. Not fixed as yet
Visitor, 2006 Volkswagen Passat, 90,000 mi
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!
Visitor, 2009 Volkswagen Passat, 65,000 mi
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.