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Modern vehicles are expected to both be able to provide thermal comfort and to insure visibility for safe driving by preventing frost formation on the windows even at temperatures of below −20°C. Frost formation is the phenomenon resulting from breathed vapor which saturates along the inner surface of the windows at below 0°C and prevents the penetration of light from outside. To analyze the formation of frost on vehicle windows, the air flow in the compartment that controls the transfer of breathed vapor and the local air flow along the inner surface of the windows were observed using a herium bubble tracing method.