HVAC Oder Due to Mildew in Heater Box on Mercedes-Benz CLK350

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: 56,525 (20,000–124,000)
4 model years affected: 2006, 2007, 2008, 2009
18 people reported this problem
Viewing 1 - 9 of 9 comments
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.
Same situation, Contacted dealer paid 250.00 for the service at the Grapevine TX dealer ship. Cost of service included, the air filter change, and to flush the system with a solvent, to help eliminate the odor...Smell came back with in 60 days.