A musty odor may be noted from the heating, ventilation and AC (HVAC) system after sitting for two hours or more due to condensation in the heater case. Our technicians tell us that a cleaner is available for the heater case and the drain system should be checked for debris.Google+
Car Problem Reports
Volkswagen Beetle Odor from HVAC vents
Volkswagen Beetle Problem
Average Mileage: 51,800 mi (30,000 mi - 109,000 mi)
Visitor, 2003 Volkswagen Beetle, 109,000 mi
same musty odor when switching from heat to ac and ac to heat
When switching from heat to AC or back to AC.
Visitor, 2005 Volkswagen Beetle, 40,000 mi
not fixed...just open the windows with the AC on high, till odor goes away.
Dealership used a very strong cleaner. It took days for it to air out.