HVAC Oder Due to Mildew in Heater Box on Mercedes-Benz CLK550

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.

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Average mileage: 73,900 (57,800–90,000)
3 model years affected: 2007, 2008, 2009
5 people reported this problem
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problem details
2008 Mercedes-Benz CLK550 90,000 mi,
started about 90,000 miles. Smells any time you turn on the heat or the AC