What is that musty smell coming from my vents inside the car?
This is a known problem with our cars where mildew builds up in the collector basin in the cars. This normally happens when running the AC on MAX for long periods of time, and then letting the car sit immediately after for long periods of time. Moisture builds up in there and has no where to go when the car is off, so mold forms. A couple ways to fix this problem is to turn your AC off and just leave the vent blowing outside air into the car shortly before turning the car off. There is another option where people drill a hole in the plastic intake box and spraying some type of bacteria killer in there like Lysol of Hydrogen Peroxide.