What are the effects of water entering through an open car window?

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Generally speaking, a small amount of rainwater drifting into the car or a large-scale water ingress will not damage the internal wiring system of the car, nor will it affect the mechanical system. Here are the specific details: Reasons: Because the car's electrical system is protected by sheathed wires, problems are not easily caused. If you notice abnormal headlights or other functional abnormalities while driving, it is advisable to have them inspected and repaired promptly. Water accumulation on the car floor: If water seeps under the floor mat or if the car still emits a persistent musty smell after drying, it means that the area beneath the floor mat, including materials like foam, has become wet and moldy. In such cases, it is necessary to visit a professional auto repair shop to remove the seats and lift the floor mat for thorough cleaning to eliminate the musty odor.