Every driver is well aware that the car's lighting fixtures must always be clean and transparent. The optics of a car should not only be free of dirt, but also moisture. How to be in a situation when condensation begins to form in the headlights. And most importantly, why, in principle, such a phenomenon takes place.
Note: First of all, you should understand that slight fogging of automotive optics (in most cases) is an absolutely normal practice. This is because headlights and lanterns are not completely sealed environments. If the optics were 100% sealed, then they would burst after the first turn on. Problems begin when the condensation from the headlights does not disappear after 30 minutes from the moment the instruments are turned on.
1. Causes of fogging headlights
In total, there are three main reasons for fogging up vehicle lighting. The first is the presence of problems with the seals after an accident or due to the age of the latter. The second is a violation of air exchange due to problems with the valves to regulate the pressure. The third is a violation of the integrity of the headlight lens. If the headlights start to really sweat, then such a defect should be removed as soon as possible. First, condensation will harm the electronics. Secondly, moisture reduces the brightness of the headlights, and with it the safety of driving.
2. How to eliminate and prevent fogging of headlights
There is only one way to get rid of moisture inside the lighting fixtures - dry the lights. To do this, you can try simply leaving the car in a dry garage for a few days. If this is not possible, then the devices will have to be disassembled. It will be enough just to remove the optics housings and dry everything inside. For this, you can use an industrial hair dryer. You can remove the entire headlights and leave them dry for a couple of days. Finally, you can simply ask a repairman or an authorized dealer for help.
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After the optics are dry, the cause of the condensation must be determined. To do this, first of all, it checks the integrity of the housing and the diffuser, as well as the tightness of the seals. Particular attention should be paid to checking the air exchange valves. In case of problems, they are either cleaned or replaced with new ones.
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A source: https://novate.ru/blogs/290919/51908/