The heating, ventilation and AC (HVAC) heater box is susceptible to mildew buildup. This can result in a musty odor from the HVAC system, most noticeable when the system is first turned on.Google+
Car Problem Reports
Mercedes-Benz CLK350 Mildew in Heater Box
Mercedes-Benz CLK350 Problem
Average Mileage: 38,616 mi (24,000 mi - 60,000 mi)
Visitor, 2007 Mercedes-Benz CLK350, 41,700 mi
Definitely a strong odor coming from the HVAC system that makes it a little embarassing to have others ride along in your "luxury" automobile. Any advice on how to completely correct this would be appreciated.
Visitor, 2008 Mercedes-Benz CLK350, 29,000 mi
heavy a/c use during warm weather causing bad mildew smell especially at startup
Visitor, 2009 Mercedes-Benz CLK350, 34,000 mi
Crayon type smell in the HVAC system that is so pungent that the wife can't even stand to be in the car.
Visitor, 2007 Mercedes-Benz CLK350, 24,000 mi
I have the same issue. how do i get to the source of the problem and fix it.