To help prevent the problem turn of the a/c before you turn off the car and just let the vent run for a minute or so. This will help prevent any moisture and mold build up.
thanks, i am clueless about a/c....drove a car w/o one in the south several years, nightmare. Anyways I would really appreciate any tips on my 09mazda 6 and wifes 07mazda cx7 t.