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Turn the air conditioner off before reaching your destination. Keep the air intakes clear of leaves and other debris. Run the blower without the air conditioner on periodically.

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Make it a habit to turn your air conditioner off while letting the fan blow a few minutes before you reach any destination. Try to do this about three to five minutes before turning off your engine. Letting the fan blow a few minutes after turning off the A/C will help dry your vent system, preventing mold growth. Never let anything collect around your A/C intakes. Brush away debris weekly, or more often if necessary. Leaves and other debris that accumulates around the windshield cowling are a leading cause of mold growth in the A/C vent system. Every two or three months, choose a warm, dry day to clear out your A/C vents using the fan blower. Open all the car doors, make sure the A/C is off, and turn the blower on max. Regularly drying out your vent systems using this technique will prevent future mold growth.