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...Many solutions to this problem involve the professional application of a biocide. But if you own a General Motors car or light truck built in the last decade, there is another alternative: an electronic evaporator dryer available from GM dealers as part No. 12497910 or from AC Delco as part No. 15-5876. An earlier version came out a couple years ago...
I have the same on mine. There was a service bulletin from GM, that if the owner complained about a mold smell to install this module. It turns on the blower fan on twice during the first 20 minutes after the car has been turned off to blow the water off of the AC coil so the water would not sit there and mold. I live in South Florida and I'm glad I have it. My car never smells musty.