What's the musky smell out my vents? The first component to check is the drainage tube. If the tube is blocked it will trap the water and cause mildew to set it. Some vehicles have a foam type material that surrounds the evaporator. If this foam becomes wet from condensation or other means then it also has the tendency to cause the musky smell. There are procedures that can be done to eliminate the problem.
The second component to check would be the a/c cabin filter.
For years, Import vehicles have incorporated these cabin filters. Cabin Filters work in the same manner as a home cabin filter. If dirty can give a foul odor and poor air flow. Most auto manufactures recommend to replace every 10 to 15K miles. Most cabin filters are located behind the glove box in the evaporative box (see owners manual for location and replacement instructions).
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