The owner bought a Tiggo 5 in March 2014. On August 20, he first discovered two headlights at the same time, and went to the 4S shop for inspection. After that, the left front headlight assembly was replaced, but the new assembly was replaced. It took a few hours to find that it was foggy again. The next day I came to the 4S shop again. The technician said that it would be watery from the warehouse, and the owner would watch the car for a few more days. On August 30, there was a rain, the headlights were foggy again and there were drops of water. The owner came to the 4S shop again. The staff said that it could be eliminated in 30 minutes, but it was not eliminated after more than 40 minutes. 
The reason for the fogging of the headlights is mostly due to the high humidity of the air, which causes the water vapor in the air to condense in the headlights. At this time, the fogging of the headlights is a normal phenomenon. The reason for the fog is only related to the humidity of the air. Generally, the water vapor of the headlights is not much condensed. After the headlights are turned on for 15 minutes, the water vapor will evaporate. Stay in the headlights.
If it is raining, washing the car, the inside of the headlights of the snow-making car enters a large amount of accumulated water, indicating that the headlights have been severely sealed and the water is not tight. At this time, the interior of the car headlights not only has a large amount of fog but also a large amount of water. If your car is after washing the car, after the rain, after the snow, the car headlights will always have a lot of fog and water, then your headlights must be replaced or re-sealed.
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