Spray an antiseptic into the exterior air vents (where your car pulls air from outside into the car from). Be sure your AC is set to the setting that pulls air from outside in, so that the spray is pulled into the ventilation system and can directly work at killing of mold and bacteria.
Why does my car air conditioner smell musty when I turn it on?
Mold and Bacteria Probably one of the reasons why there is a distinct smell in your air conditioner when you turn it on is the growth of mold in your air vents. Smells of mildew in your car may be caused by the growth of bacteria. As the car becomes older, bacteria, mold, fungi, and micro-organisms can start to grow.
