Mold-like smell appears when moisture concentrates in the conditioning and ventilation system with a help of which cool air gets into compartment of the car. In this case the perfect conditions for generation of invisible bacteria are created. Such microorganisms are usually generated in warm and wet climate. This mold- like smell appears due to microbial products of these bacteria. In order to prevent such bad smell it is recommended to clean conditioning and ventilation system from time to time.