HVAC Oder Due to Mildew in Heater Box on Mercedes-Benz C240 4MATIC

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 247,500 (245,000–250,000)
3 model years affected: 2003, 2004, 2005
6 people reported this problem