How to deal with water mist inside car headlight covers?
2 Answers
Place desiccant and frequently turn on the headlights to dry out the moisture inside. Generally, it will dissipate in about a week. If there is severe water accumulation inside the headlights, you should go to a professional 4S store or repair shop to replace the headlight rear cover seal and vent tube.
I once encountered a situation where my car headlight cover fogged up, which was quite worrying at the time. Later, I found out it was caused by poor sealing. The usual reasons are aging headlight seals or small cracks in the cover, allowing rainwater and moisture to enter and condense into fog when it gets cold. The solution is not to rush into disassembling it—first, park the car in sunlight to let natural heat evaporate the moisture, or use a hairdryer on low setting to blow warm air at the cover for a few minutes to dry the inside. Make sure the light is completely dry before checking for any damage. If you find the seal deformed or cracked, just buy a new one from an auto parts store and replace it yourself—it’s cost-effective and convenient. For regular maintenance, keep the edges of the light base clean to prevent dust buildup from affecting the seal. Safety comes first—excessive fogging can impair nighttime driving visibility and increase accident risks. Address any issues promptly or get a professional inspection if needed.
